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.
Cult Classic: Despite the problems, the large open world was still appealing enough for the first game to gain it some fans, particularly fans of other open world RPGs. Patches for the PC version have improved its status over time.
Demonic Spiders: Werebeasts in the second game if you're not a melee character. Enjoy being charged at by a Cheetah that inflicts massive damage and is immune to blindness effects.
Remember how badly alchemy broke Oblivion? Now imagine if those stat boosts were permanent. It's possible to kill the final boss in two hits with a properly powered-up character in the first game.
Permanent stat bonuses are removed in the second game, but some of the most inventive aspects of the alchemy/spell system result in overpowered mechanics. For example, a character will usually accumulate enough materials to concoct 10 potions to resurrect them upon death— and if that's not enough, resurrection exists in spell form.
One of the weaknesses of the "mage" archetypal character is that missile spells don't stunlock enemies like melee weapons (and, to a lesser extent, ranged weapons) do. While melee characters usually have an easy time one-on-one, mages must result to kiting... until they figure out that they can combine a missile with an area-effect that blinds opponents, resulting in an even longer stun than expected for most enemies, though those who are immune suddenly become Demonic Spiders in comparison.
Missile spells are affected by the spray modifier, turning one projectile into many. Not only does this resulting in a shotgun effect where adventurous mages will aim to inflict triple or more damage by attacking upclose, but the fact that missiles can be combined with another carrier card can resulting in a mage instantly summon numerous minions that surround enemies and stop them from being a threat.
Part of the danger of the Swamps in the third chapter is because of how little walking room there is, resulting in characters being surrounded by the flying Vespines or the undead who are able to wade through the deep water. Introducing the water-walking ability, in both spell and alchemy form...
Invisibility. It exists in alchemy form at the very end (in severely limited form) for a reason: access to it in spell form, which is fairly simple (Air + Enchant + Time) results in all forms of characters benefiting from the ability to lockpick from virtually any area if they cast this spell (even in homes, resulting in an excess of loot), avoiding "ambush" encounters with triggered spawns, and retreating from combat or sneaking without having to worry about its complications.
Summoning in the second game. In the first game it was overpriced and weak; but in the second, you can easily swamp the enemy with hordes of instantly-summoned, incredibly-tough giant scorpions or viciously fast stunlocking skeletons, and can rapidly resummon any that get killed.
Goddamned Bats: Cheetahs and hyenas in the second game. They're not terribly strong, but they have an annoying habit of running away from you until they're out of range of your auto-targeting crosshair, then lying down in the tall grass so you can't see them. When you come near, they run up to you you, take a swipe at you, and repeat the whole process. They'll remain annoying even after you're powerful enough to instakill them by slapping them with the back of your hand.
Jerk Sue: The first game's protagonist is incredibly arrogant, but everyone responds to him with respect or praise rather than the irritation one would expect. And he never does get called out on causing the massacre of an entire city to further his own goals.
On the other hand, he does have his moments of doing some missions simply because he wants to and not because he's a greedy prick, and by the second game, he's FAR more likable, mostly by virtue of the fact most of the stuff he did in the first game came back to epically bite him in the ass.
Just the dialogue and character models in the second. For example, the ghost busters reference (...Are you a god?) on the main page's Shout-Out section takes place in the middle of a semi-serious guild plotline. In general, the protagonist's snark diffuses a lot of the more cliche quests.
Porting Disaster: Two Worlds was obviously meant to be a PC game. The Xbox 360 version has inferior graphics, an almost-unusable user interface, and more bugs than you can shake a can of RAID at. The second game has some bizarre mix of console and PC disadvantages in the user interface, such as being unable to select some (minor but very noticable) things with the mouse but otherwise retaining an obvious leaning towards PC functionality.
Sequel Displacement: The second game sold more than two million units, despite the reputation of the first game.
So Bad, It's Good: The first game. Imagine if you will a game filled to the brim with game-breaking bugs (which aren't as much of an issue in the original PC version, especially with later bug fixes) third-person Oblivion clone with a hero who runs around like he's got a load in his pants all the while spouting the worst one-liners ever and talking to peasants who mispronounce every other word. No jump animation. One attack animation, maybe two if you count that goofy figure-eight swing he does. A lot of this has to do with the massive amounts of Narm Charm present in the game.
They Wasted a Perfectly Good Plot: The first part takes place in Northern Antaloor, which was just recently shaken by a bunch of sleezy jerkasses who took control of the region via political intrigue and imposed a bunch of laws the populace hates. The main quest of that area involves a lot of political intrigue and the like that could have been fleshed out and given more overall depth. In the South, there's a lot of tension and concern over the invading Orc armies, and in fact when you get to the capital city of Cathalon, you can see siege machines being set up across the river by Orcs. Once again, the epic potential of this stock Fantasy trope is epically wasted because, all in all, you don't really even do too much to help end the war.