I keep coming back to this game every year. The enemies, guns, blood and animations always felt like playing through an episode of MC. I think the game still holds pretty strong to this day, hell, Nexus 2 could have just been an updated version of this and it would've been good too.
Arena mode still keeps me playing for a long time and playing the protagonists in Story mode is always fun.
I see a lot of comments about Arena not working properly, try it with the Newgrounds Player! Everything works properly with it.