Iron Man vs Jericho missiles would have been awesome reminds me of when I watched Macross Zero (jump to 35 seconds)
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I too felt that the final battle felt too short and too generic. When I saw the trailers I felt that this fight was going to feel epic, intense, awe inspiring and pretty much something I hadn't really seen before. Basically I felt that it was going to be like the Spider-man 2 train sequence.
The Iron Man fight felt like it was just high point after high point after high point instead of the Spider-man 2 fight was like one long rush. With Iron Man it was freeway, and then the car, and then the bus, and then the flight, and then the ark reactor. It felt like the action was split up into smaller ones. With Spider-man it was like blow, after blow, after blow was exchanged so it felt like one long continuous fluid fight. Also to me the Spider-man fight felt more intense because I could see that he had no protection so when he got hit I knew it hurt. And also many of the shots just looked amazing like when Spider-man had to swing back to the train and when he had to stop it. Not that Iron Man didn't have any cool looking scenes but I just felt that Spider-man's were better. And that brings up another point, the train sequence had an immediate sense of danger because you could see that the tracks were ending. Now I know Iron Man had danger too because if Iron Man lost Stane would have spread the armor and who know's what would have happened, but because it had to be inferred and not seen that immediate sense of danger was not there. The only danger felt was that Tony could going to die, now we also knew in Spider-man 2 that Spider-man could die but we also knew that everyone in that train could too so it adds to the sense of danger. Also on the point of danger I don't know about anyone else but with Spider-man 2 I felt a great deal of anticipation and joy when Spider-man was able to stop the train because I knew that he only had a slim chance of saving everyone and when he overcame the odds and saved the day it was just an amazing feeling. With Iron Man there was some anticipation but when he defeated Iron Monger it was like "Yeah he was beaten but all you did was have a girl push a button, you didn't really overcome impossible odds." Also the lack of a good score really drags down the final Iron Man fight. Scores can really add to a scene and Iron Man's really didn't add anything at all.
I'm sorry if this sounds like a rant but I just feel compelled to defend mine and everyone else's opinion that the final Iron Man fight was not up to par with what a superhero fight should be.
P.S. I also watch alot of anime, especially mecha anime so when I first saw the trailers I thought of the fantastic fight sequences I had scene in anime so you can understand if I was a little let down.