I picked up the DVD of Iron Man in the supermarket about a year ago and have only just got round to watching it. What can I say? It was great fun and, if you haven't seen it, I recommend you do.
Of course the usual big hole was there: power supply. In this they got round it by 'genius creates a palm-sized fusion reactor in a cave'. It's the kind of thing we saw a lot in SF many decades ago but we're too wise to go with now ... or could it be that we're too cynical and pessimistic? Thinking on this sort of thing let me to You Tube where I note that military exoskeletons are getting closer:
However, note the power cables. Power storage is always going to be a problem ... unless of course you actually wear the battery?