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.
Anticlimax Boss: Kraven the Hunter. He's built up as a highly skilled warrior who decided to take down Spider-Man. Peter isn't even remotely interested in fighting him (he'd just beaten Doctor Octopus at the time) but when Kraven insists, Peter simply dodges a few times then knocks him out with a single blow. Instantly lampshaded by Spider-Man.
Peter: Huh. I thought he had super powers or something. Showbiz phony.
Arc Fatigue: Many felt that the Double Trouble Doc Ock/Kraven the Hunter arc ran too long.
Kitty Pryde, who is either considered a welcome addition to the cast, or Bendis' own personal Mary Sue.
Chances are that another one is on the horizon with the real death of Peter and the start of a new series featuring a different character under the mask thus turning Ultimate Spidey into a Legacy Character. Can you spell Flame Bait?
Spider-Men, the crossover between the 616 & Ultimate universes to celebrate the fiftieth anniversary of Spider-Man's first appearance — is it a great idea, or yet another case of Quesada dropping the ball, given his previous comments on the matter of a 616/Ultimate universe crossover. Is it too soon to have Miles meet 616!Peter since the former is still finding his feet as a superhero, or just a wasted idea since it comes the year after Ultimate Peter was killed?
For some, it's when Mark Bagley left the series. His Spider-Man design is iconic (Marvel used to use it for merchandising all the time) and Mark Bagley basically defined Ultimate Spider-Man and its world.
For others, it's when Ultimate Spider-Man got relaunched as Ultimate Comics: Spider-Man
For even more it's when Ultimate Comics: Spider-Man was again relaunched with Miles Morales as Spider-Man.
Complaining about Shows You Don't Watch: It is truly amazing when people sum up Miles' origin as exactly the same as Peter's except that he is black and complain that he is too young despite Ultimate Peter just being two years older and the original being just a year older. Or go beyond being petty and say that we need an older Spider-man despite the fact that 616 is that older Spider-man and every other comic adaptation of the character has always been grown up.
Back in the early nineties, one of the most famous songs by Italian band note 883: that now, by the way, is no more since its lead singer is now pursuing a solo career was titled "Hanno Ucciso L'Uomo Ragno", which is Italian for "They Killed Spider-Man". Fast-forward by twenty-years-or-so.
In "Cats and Queens", the focus of MJ's story was her wanting to run away from home so she and peter could be married, with him saying he'll always be there for her. Also in the same arc, Black Cat tells him he'll have seven years bad luck. This was in 2004...
At July 2005's San Diego Comic Con, in response to the question the Ultimate & 616 universes crossing over, Joe Quesada stated that he'd rather close down one universe than have them cross over because it meant they were officially out of ideas. Fast forward to 2012, and Marvel announced that they will be having 616!Peter crossing over to the Ultimate universe to meet Miles.
A small detail, but in the 2004 "Hollywood" arc, when Peter fights Doc Ock on the set of a new Spider-Man movie, a black stuntman in a Spidey outfit hits Doc Ock with a camera. When he tells Spidey that he's just a stuntman, not the actor playing him, Peter says "I thought I got revamped there for a second..."
In one of the first issues, a photo can be seen that shows a young Peter with his aunt and uncle at Disney World. This was many years before Disney actually purchased the company.
In issue 13 of the relaunch, both the original Peter and Jameson are tied up after being caught by the Chameleon siblings. While the brother was robbing a bank as Spider-Man, the sister took on the face of J. Jonah Jameson (but with a scantily clad female body) proceeded to shoot the original Jameson in the head. Right in front of Peter. Ugh.
The storyline in which Deadpool and the mercenaries take Spider-man and the X-Men to face "justice" on that game show. Starts with a school full of unsuspecting people getting knocked out and kidnapped and ends with them having to rescue Xavier, who is stripped, chained up, and has his eyes pried open ala Clockwork Orange, so he is forced to watch his students be killed.
Carol Danvers qualifies over and over again. She refused to just put Norman down, instead, every single time she chose to keep him alive in a prison he's proven capable of breaking out of at will. This reaches critical mass at the start of The Death of Spider-Man - not just Norman, but five other dangerous superpowered criminals break out of the Triskelion, all of whom are enemies of Spider-Man, and the last time five of the six teamed up, it required the Ultimates to stop them. So she not only sends the Ultimates off to fight Nick Fury's Avengers to cover her own ass, but she doesn't even tell Spider-Man that six of his enemies have all escaped from incarceration, all so that she can keep the breakout a secret. And the kicker? Because she inadvertently caused the death of Spider-Man, this wound up being the straw that broke the camel's back and got her fired from her position as Director of S.H.I.E.L.D.
Though how much of that is due to Nick Fury's planning is very much debatable. At least 2 characters have voiced the idea that he directly caused the events leading up to Spidey's death. Though to be fair neither is entirely neutral in the matter. One being MJ and the other being Fury's ex wife Black Widow 2. And even Nick Fury himself admits that he's to blame.
In all honesty, neither of the two are to blame. During this time, Nick Fury was away for some unknown reasons and picked up intel that Carol Danvers was selling SHIELD secrets to other countries so he assembled a group of Super heroes to take her down knowing that he would have to face the Ultimates. Yes, Carol could have put a bullet in Osborn immediately like she had already done before, but she was told by one of her subordinates that Osborn lost his power and wanted to see why and how he was alive. This is not excluding the fact that she was Genre Saavy enough to keep the corpse of Osborn because she was not sure that he'd stay dead. She was hoping she could contain the situation before Parker found out what was going on hence why she recalled Captain America from his training of Peter Parker. It wasn't until Fury showed up with his band of supers that priorities immediately changed. Carol was under the impression that Nick Fury betrayed the country and was subsequently hit by a car during the superhero brawl going on at the time. However, this was all a ploy by Tony Stark's brother, Gregory Stark, to take control of the SHIELD for himself so he can one up Tony. It wasn't negligence from either's part that killed Peter, but a series of unfortunate events.