These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Germans Love Second Life: Second Life is very popular in Germany, particularly sims dedicated to fetishes. At certain times of the day, a functional understanding of German is needed to know what people are talking about and a lot of long-term Second Lifers at least know tourist-level German just through passive exposure.
Internet Backdraft: Came in full force when it was revealed Linden Labs was trying to make user profiles be like Facebook, privacy issues and all, and made their profiles public to the Internet (to help generate revenue from advertising) instead of restricting it to be within Second Life. Only after the massive shitstorm did Linden Labs allow users to restrict their profiles from being displayed on the web... which also prevented anyone else from viewing their profile.
There was also major backlash from people when Linden Labs revealed that 3rd party viewers could no longer create features that changes the viewer's experience. This means unless Linden Labs gives the go ahead or the feature is something that is used across the board, no one is allowed to make a viewer with radically different features.
Never Live It Down: SL had a real problem early on with every sim being an ad farm or some kind of sex sim. They've since made adjustments to eliminate the ad farms and creates some segregation between the sexual and non sexual areas but the reputation remains.
SL is a Mecca for practitioners of Gorean bondage role-play.
Rule Thirty Six: Even more obviously. If it's even slightly kinky, someone's made objects and areas to cater to it.
One user is creating an RLV trap that forces people to read this very Wiki.
Scrappy Mechanic: Any item that is created with a "No Copy" permission. Items marked as being no copy are usually made this way if they are a part of a game and require that the players don't cheat by making multiple copies. Most creators make their products under the no copy permission, which can greatly frustrate people who want to make backup copies of their items when editing them, such as clothes or avatar parts.
"Stop Having Fun" Guys: The attitude of many people when it comes to using free or cheap items. Apparently, only real men will spend real money to obtain good items.
The Griefers and those that oppose them. While some griefers are in it for the fun and some of the anti-griefers are in it to help out other residents who would rather not be harrassed, other griefers have declared war and plenty of the anti-griefers respond in kind (and are effectively griefers themselves.)
After rigged mesh became widely available, outfits using the older methods (such as flexiprims) became a point of scorn. Some mesh developers have gone on to put out free mesh items so users can fit in better without spending money.
A lot of people really, really hate "sit-hopping". If a user right-clicks an object, even if it's not a seat, and clicks to sit on it, they'll be teleported to the object and awkwardly sit on it. Many people use sitting on random things and promptly standing up as a way to quickly move around a sim. Some people feel it undermines the immersion of the environment, in other places it can be used to bypass locked doors (the camera can free-roam through the environment and is not subject to clipping) forcing the sim manager to set up blocking zones to keep people from simply hopping past doors.
They Changed It, Now It Sucks: Viewer 2 in spades. Complaints ranging from ugly UI design to horrible performance. LL has no intentions of changing viewer 2/3's interface, which caused users to flock to third party viewers that are based on the UI of viewer 1 and some of the 3rd party viewers are using features from viewer 2 (display names, alpha textures for the body, etc).
Phoenix Viewer, a 3rd party viewer that was made after Emerald Viewer was banned, was stated to have development for it stop after they import the mesh feature to it so that the development team can focus on improving their Firestorm Viewer (based on viewer 2/3) and have said that it takes tons of coding and time to be importing new features into an old Second Life viewer, which is why they want to focus on Firestorm. The fan base was NOT happy.
User names were changed where all new accounts will always have "Resident" as their last name while in the past, people could choose their own last name. Many were upset at this change though people who signed up under the old name system would still have the last name they signed up for.
Linden Labs trying to phase out Viewer 1 also generated this from many people. No one likes how Linden Labs is forcing people to use more resource intensive viewers.
More egregiously, the same users may not have realized that Linden Labs has allowed out of date viewers to still connect, despite being probably the only MMO that does not force all users to update to the latest software before connecting, at the expense of a broken and possibly insecure user experience.
This will not last much longer thanks to Linden Labs pushing out features that are not compatible with their old viewers. Mesh objects won't be displayed correctly in a Viewer 1 client and the new server side baking (which handles how avatars are loaded) are also incompatible with old viewers. You can still use the old viewers if you want to, but you won't see everything properly.
A "spiritual sequel" was announced to be in the works. Linden Labs stated that people wouldn't be able to transfer their inventories to the new game (at least not at first) and that there wouldn't be any 3rd party viewers at launch (again, not at first). Nearly everyone displayed worry and disgust over the potential of losing all of the items they invested in from the past several years and fear that Linden Labs is trying to gain full control by stopping 3rd party viewers from showing up.
Uncanny Valley: Ever seen an avatar with lip synch problems? It's even worse when the speaker is highly emotional and the avatar just stands there, perfectly calm.
The default avatar animations also look weird by themselves as they are quite stiff and not fluid. This gets even weirder on tall or short avatars since they all use the same animations. It's no small wonder that people seek out custom animations.
Avatar heights also look very odd. Trying to make a realistic 5' 7" human avatar by Second Life's standards makes you look like a midget or even a child. This is mostly due to the way Second Life puts objects and people in perspective, which usually just forces people to build their avatars taller than normal so it looks proportionally correct.
Using the default avatars, after some tweaking, will usually look just fine, but if you try to make your avatar look fat without the use of prims attached to your body, the avatar will just look plain weird. An avatar with a maxed out belly setting looks wrinkled and not smoothed out like a typical obese belly, nor does the belly sag down; it just sticks out and doesn't sag. The way the avatars are rendered for extreme body fat are just plain unrealistic at best.