Huge fun, ragdoll phisics and great powers does (but barely) survive the horrible glitch onslaught.
Add on content is fine but does not provide more than 2 hours total, total waste of money.
Some missions are a real blast, others not so much.... glithces, bugs and hard objectives make them very difficult, some parts are better just to run throught than to fight throught them as you can get stuck and seriously mad.
The games ragdoll phisics are very fun and are the games main attractive, they may be even usefull for some kind of stress relieving, well untill you hit on of those makes-you-wanna bang-your-head-with-the-keyboard glitches.
Conclusion
fine, playable, (allthought horribly buged/glitched but better spent your money on other way better games.