Yeah, that was a bizarre rendition of that song and just kind of a weird choice for that part of the show.
Overall, I thought it was a decent episode, but it didn't really feel like a season premiere. It felt anticlimactic given what went down at the end of the last season.
The violence didn't actually bother me, to be honest. I think mainly because it's kinda cheap looking. I almost feel like I can see the tubes and the blood packs the actors are wearing.
I put my comments in spoilers. I wasn't sure if we were openly talking about the show or what. I don't like being the one to ruin things for anyone.