OK, here's the deal.  I bought the whole "fusion power cell to power the electromagnet keeping the shrapnel away from the heart" thing in the first movie, but during the second one, when Tony Stark was dying of Palladium poisoning it suddenly occurred to me that an electromagnet powerful enough to keep a few ounces of metal away from your heart could be powered by a couple watch batteries.  Sure, you could argue you need the blue glowy thing to power the Iron Man suit, but really couldn't you just attach the power cell to the armor and not kill yourself?  Also, if the suit requires a Palladium power cell that is attached to Tony Stark's body, how did the War Machine suit work?

Sigh.  I guess continuity is not really a priority these days, and the truth is I did enjoy Iron Man 2.  Didn't see it twice, and I saw the first one three times, so I guess that indicates which I thought was the better one.  

I think my favorite experience with power armor would have to be the video game Fallout 2.  Post-apocalypse has always appealed to me, and that game was the best.  The turn based combat was a little sluggish, but you could be as messed up as you wanted to.  I loved it.

Power armor is also the main reason why I hated the movie Starship Troopers.  Within the first two minutes they totally eliminated the two main points that made the book by Robert Heinlein great: the soldiers have really cool power armor and get shot out of giant cannons from space.  Instead, they opted to keep all of Heinlein's neo-Nazi political views.  That's like buying an ice cream cone and just eating the wrapper the cone comes in.  Come on.  Special effects aren't THAT expensive.