Absolutely the most amazingly boneheaded thing with Motorstorm was the inclusion of night races... without headlights. I consider myself to be fairly good at racing games, but coupling the poor visibility with the mongoloid-on-speed behavior of the A.I. opponents made for some impossible races later on in the game.
Oh well, it had an awesome racing base, many great moments there, so hopefully the team has focused almost squarely on fixing the broken bits.