I'm at about 127 missions or so. My problem is that I spent waaay too long fighting EVERY random battle that appeared because I was wanted to make sure my guys all had as much experience as possible.
Did you get those 298 missions on your own, or did you research how to get all the required mission items you need? I went for the longest time with two missions asking me for jerky that I didn't have, and I know there are a ton of others calling for items I don't have now. I guess what I'm asking is whether or not the items I need will happen to appear, or if I have to *make* them appear.
It's easier to play than I thought it would be, but I can't pull off a finisher outside of the tutorial. That kind of ruins the fun for me. The "tag team" aspect doesn't really fly when all the characters feel the same to play.