Games alike to EDF 4.1?

My friends and I just finished our first run through EDF 4.1, and we had a blast. We each accumulated about 60 hours in the game doing so. Some of that was probably spent goofing around on other classes or strengthening up a bit for the three or four missions we got stuck on. All in all though, I'm amazed that it took us that long to get through.

Actually, I'd say that's my response to this game in general. For something I had never really heard of, it was surprisingly good. The game was ridiculous at the start with the giant bugs but as it went it somehow just got crazier and crazier. The scale of the game was just fantastic in terms of enemy variety and size. The hilarity of the B movie writing paired with the outrageous gameplay made it an uproar between the four of us.

The progression system was decent and probably the weakest point. The sheer amount of equipment was a big plus, since it's always exciting to see something new at the end of a mission and find out if it's any good or not, but it was pretty easy to identify an optimal strategy for each mission. There were some classes of weapons (for ranger at least) that were outright useless in a practical sense, which is disappointing. The variety in weapon design is great, but it's unfortunate that it couldn't be more balanced.

Are there any other games that really scratch this itch? I can think of a lot of four-player co-op games that don't really fill that void. EDF is too fast-paced, has too many good "wtf moments", and has too enjoyable a progression system. For those of y'all on ~ who have played it: what other games did you enjoy that were sort of alike to EDF 4.1?