The main point I want to mention is in the title. If you enjoyed playing through the Dead Rising 3 story with a friend, you'll be easily disappointed to find out that the story mode in Dead Rising 4 is strictly single player. I'm confused by the decision to do so considering the big change in not forcing you to watch the clock, having to administer zombrex, or even escorting survivors to the safe rooms. After playing a few hours fighting off the zombies, exploring, and progressing the story, I find it missing the hilarious, exciting, and fun moments that my friend and I came to enjoy in the previous title. Yes, there is still a CoOp mode to be played in Dead Rising 4, but trust me it's a whole separate experience aside from the general game play. The fact that we were expecting a 4 player CoOp and getting in a completely different way was just very disappointing.
So is the other CoOp mode fun? Sure! I'd be lying if I said there weren't any fun to be had in this mode, but I find it weird that they approached it in a different way than they did with the story mode. In the 4 player CoOp you are required to complete missions that unlock more missions as you go. Everything here is pretty much time based including the part where you must find the next safe room. Failure to find the next safe room, even without being killed by zombies will result in a game over. This takes away from wanting to explore and screw around with everything you can find within this game. Time again forces you to go complete missions in certain areas, rather than freely roaming about as you would in the story mode.
Should you pick up the game? Not at full price. I would say $30 sounds like a fair deal, anything lower is much better of course. Just my personal opinion, but this is definitely going to be a game I rush through and trade back in. If story mode CoOp was there, I'm sure my friend and I would have taken a lot of time exploring everything and screwing around adding more to the game time, but again, it's a single player experience.