Custom guns were okay. The Railway Rifle was hilarious, the Dart Gun was okay, the Shiskabab was okay, The Deathclaw gauntlet was cool, but wasn't too useful unless you were brawl, since it ignored armor. Everything else was pretty ineffective. I've only found one place in the game where landmines have been useful (although I've heard that there's another good one), grenades lose their touch once you hit level 10 and start getting massive amounts of small guns ammo, and the Rock-It Launcher was just annoying.
But that's my point, if they can get like a couple dozen custom weapons going, that would be awesome, and we'd be sure to get some good ones.
Co-Op COULD work, but after seeing it be so meh in Fable 2, I'm hesitant. However, if you could get a Boarderlands thing going, it could be really fun.
Wanna listen to me rant about stuff? I started a blog!
https://theloonybinblog.wordpress.com/