What I want is to see the hero deliver his own bit of butt kicking to the enemy. I usually don't want him to be all powerful compared to the enemy (exception being IM vs terrorists in Gulmira, 'cause that scene was awsome) but I do want to see him get several good hits in to punish the bad guy.
One example of where this sort of thing worked well was the climax in Blade 2 with Blade fighting Nomak.
Nomak was stronger, faster, and more durable than Blade, but during the first few minutes of the battle Blade demonstrated that he was far from helpless against him; charging right at Nomak throwing punches, kicks, and elbows to his face. Nomak eventually started to overpower Blade but Blade put up a good fight despite the odds; he didn't spend the whole fight running.
The Spider-Man 2 fights were great too.
Between the 90s cartoon and the first Sam Raimi movie I've come to expect to see Spider-Man be on the defensive during a fight if not completely getting his butt kicked, so when I saw Spider-Man clocking Doc Ock with punches, backhands and freakin' headbutts during Spider-Man 2, I was like, '@#$% yeah Spider-Man, get'm!'
He wasn't helpless in those scenes like he was in the first movie during the fight against Green Goblin, and I was glad for it!
Iron Man's battle with Iron Monger was pretty good IMO, but it could have been more. I wanted to see Iron Man show what he can really do, and I didn't get it. That's what disappointed me, and I think that's what disappointed other people who otherwise had no problems with the movie.
Let's hope they get it right next go-around.