I loved Ultimates Vol 1 and 2 and Millar's Ultimate Avengers. I also disagree with the characterisation that everyones a jerk. MCU Stark is pretty much the Ultimate version but with 616 History and 616 Iron Man suits. Ultimate Thor is a Jesus Allegory. Ultimate Captain America is no more of an "unlikeable" "Jerk" than Jack Bauer, James Bond, or John McClane he's a hardened badass in their vein but with 1940s mentality and lingo. Hank Pym is a jerk though worse than a jerk actually.
and I think Ultimate Iron Man, Captain America(despite being taken to the extreme for some moments like the french comment he made or using kindergarten kids as a shield against War Machine), Thor and Quicksilver(despite the incest that really went overboard when Jeph came on) and Ultimate Captain America had likable moments as well. While Ultimate Captain America is more harsher and soldier like than 616 or Chris Evans Captain America he isn't simply a jingoistic jerk as people make him out to be and there is more to his character than that (I think despite jerk moments that made him despicable he also had good moments that made him a likable character under certain writers(Mark Millar, Brian Michael Bendis who make all the Ultimate heroes more likable imo,Jason Aaron in the last issues of the Ultimate Captain America mini series, Warren Ellis, etc) and I felt fleshed him out more than certain writers that aren't Ed Brubaker, Mark Waid, Jack Kirby, Stan Lee, etc did with 616 Captain America at times):
-most of Ultimates volume 1#3 when he visits Bucky and Gail, goes to see how many of his family members are still alive and when random people broke into his apartment to vandalize it when he wants to move into his own neighborhood(which is also kind of sad and feel sympathetic for his character as well).
-the scene with Nick Fury in the White House at the end of Ultimates volume 1
-the scene between Ultimate Cap and Mimic in Ultimate Avengers vs New Ultimates which also shows that Captain America visits soldiers in Afghanistan to supply them Thanks Giving Turkeys and simply being there as a moral boost for his fellow country men in Ultimate Avengers vs. New Ultimates #1.
- the scene in Ultimate Captain America#1 where he says he's done hiding in the shadows after being the ice for so long(hate the way he did it but I like the thing he said)
-The scene at the end of Ultimate 2#13, when skinny Steve tells Gail “They’re gonna make me into a super-soldier and I’m gonna help put an end to all this fighting.” (which as the article explained is ironic in itself
http://sequart.org/magazine/2793/mark-millars-the-ultimates-pt-4-more-betrayal/)
- 2 of the scenes when Captain America shared with Spidey in Death of Spider-Man arc on the graveyard(Ultimate Spider-Man#156) where he tries to teach Peter the lesson on fighting smart versus fighting foolishly and how the second one can lead soldiers right to a cemetery and after talking to Peter and he got shot in order to save Steve's life(Ultimate_Avengers vs. New Ultimates#4) telling Peter that his wound is not fatal and commends him for taking a bullet for him without a second thought, stating that when he grows up Peter will be the best out of all of them or taking responsibility for his part in Spider-Man's death to Aunt May at the funeral
-The Captain America scenes with Nick Fury in Ultimate Six(#5 in particular) when he was dealing with monstrosities such as Green Goblin, Electro, etc being created in trying to make another Captain America/Super Soldier
- Watches Penny Singleton movies and other classics while working out.
-what he tells Nick in Ultimates volume 2#13 when the Ultimates decide to to leave S.H.I.E.L.D. and work as an independent team.
- Gets hooked into daytime television and movies such as the Terminator movies.(I would love it if Chris Evans Captain America would mention being a huge fan of Daytime Soaps over time in a movie, I love the idea of Steve being a movie fan and getting hooked into all those cheesy B movies and actually quoting them, talk to the hand)
- Accepts America's past mistakes such as what happened in Vietnam and whatnot, simply wants to work and help out America instead of complaining all the mistakes and saying America is ruined forever.
-trying to interact/make a bond more with T'Challa, forging dialect with him, then transported took him back to Wakanda, and took his place on the team of the Avengers/Ultimates(the only thing about Jeph Loeb that I liked)
-when he broke up a fight between Jean Grey, Sabretooth and Mystique and tells them he just wants to pay his respect to the fallen heroes in Ultimatum: X-Men Requiem #1
-sacrificing his life in order to distract Galactus as the others proceed to trap him in the Negative Zone in the Cataclysm event
among others