I have been to the Q for Cavs games, a Gladiator game, and most recently a Foo Fighters concert and I have had a great time every time.
At the Foo concert I felt fancy going to my seats via elevator and walking across carpet. I don't know why, we didn't pay an obscene amount for the tickets, but they were good seats, looking around the arena I didn't see too many seats that wouldn't have been good though.
The concession stands at the top of my stairs were kind of weird, beer, wine, water and margaritas. All poured out of their plastic bottles and into plastic cups. Even my water. Huh? that was weird. I guess they thought I couldn't throw my plastic cup as far as a bottle? Who knows.
I always have an easy time getting in and out and overall think it's run efficiently and is a fun venue. And I'm glad it's not called Gund Arena anymore. Always reminded me of an STD.