The game is buggy right now but it's so much fun to play while we wait for 5 to eventually come out.
This is a Crysis mod.
http://www.mechlivinglegends.net/com...page/Itemid,1/
http://www.moddb.com/mods/mechwarrio...elease-trailer
http://www.youtube.com/watch?v=lNFeE8mIlxQ