I have to say i only paid £18 for this in Tesco and found it very enjoyable, its not very relivant to the movie therefore doesn't give away the plot or spoil anything and the best part is the choice of character!
The 1st game was just you as Iron Man upgrading your Boots, Weapons and Combat Moves whereas in this game you customize the weapons, which there are many more of on Iron Man and War Machine has plenty!
You also get to upgrade the Chest Piece to your suit which can do different things. (Increase Weapon Reload Speed, Power etc)
Combat reflexes are still upgradable!
I played this both on Easy and Hard (Hard is extremely difficult), and found War Machine to be the more dominant character as he has 2 missle launchers, a mini-gun and a shotgun! Iron Mans strengths are focused in his combat which i didn't use too often!
But Iron Man has his perks with his Laser, although you don't see the true ability of this wepaon until its fully upgraded, which takes a while!
You can also customize each weapon with a different upgrade so your rocket launcher may reload faster and your mini-gun may do more damage!
You can also buy new ammo (Explosive, Armour Piercing, Pulse) all of which can be assigned to multiple guns and each gun can have a different type of ammo. Ie Mini-Gun = Armour Piercing, Shotgun = Explosive, or even the opposite way around!
I finally got my 1st Platinum playing this game, finished it last night after getting stuck on the Mid-Game Boss on Hard!
But if ever you fancy a game where you use a variety of weapons just to kills hords of enemies, Iron Man 2 is a great buy!