Wrong guitar mechanics in Rockstar mode. For example, if only one note needs to be played and that note is 3, holding down 1 and 3 should not be a miss. Learn how to play guitar before you make a game about it.
Ibuuyk said it all. The thing that upsets me the most is the DPS. I can't effectively compare my weapons if the stats are lying the me. Please fix the countless bugs.
Bad physics. Air resitstance would decrease as altitude increases. Acceleration due to gravity (how much power you need to go fast) would also decrease as altitude increases. I reached 265k ft and my head could barely move.
Sucks, right!? We're working on fixing that ASAP.