So I have put a lot of time into this game so far. It's pretty good and fun but man it is pretty buggy. Lot's of collision issues in SP and there are some level leaks (where I can fall through the map). Also, sometimes the heat seeking style rockets don't react as expected. In the original it would find it's target 99% of the time even if the target is above the player. In this version they seem to have a hard time if the target is not on the same floor or level as from where it was fired from.
MP is Fudgeing chaos! I mean like too much chaos at times. I am all for frantic twitch shooting but if you get into a crowded server..you are lucky to move 5 ft before being vaporized. I also think that it has a lot to do with smaller maps that I have played.
All in all I love the game. The nostalgia alone is worth the 14 (or 11) bucks you spend on it. Looking forward for LAN play and dedicated server files should be released soon...hopefully. I am also going to look into making custom maps too....but we'll see how far I get with that.
