The one simple thing keeping me from becoming a complete OFP fanbois is the fact that you can't join an MP game in progress. Apparently they have to rebuild the entire game from the ground up to get that feature in. I guess if they tried new MP code your pc would melt or something.
"DUde, RL friend just got on, gonna restart for him!", "Dude, this is the 20th restart, I haven't killed anything in 1.5 hours!" /sigh