The Movie: Iron Man has an awesome suit that does pretty much anything a human could ever want.
Real Life: This one is not a criticism, but an assessment of how far along we are in building a mech suit like Iron Man's. The Department of Defense has been trying to build a powered exoskeleton, a "super-soldier," for years, and have developed many prototypes through private contractors. Spacesuits prove it's possible protect humans from extreme pressures while jet-packs give us some idea of what it would be like to be your own rocket, The repulsor beams and the Arc reactor are, however, improbable — unsurprisingly, humans have not found a way to implant nukes in our chests (nor should we). But with science, anything can happen. We just hope that if a real Iron Man suit does come to fruition, Robert Downey Jr. will get the first joy ride.