As for the Naylor drums, I failed out the one time I tried "Mystery Train". The pattern was nothing like anything I had seen before. I'm not sure if it was really all that hard, or just unusual ... I wouldn't have used the word "obnoxious", but, OK.
Don't Ever Change kicked my ass on drums. Some of those Naylor tracks are... not the best on drums but as a whole they are awesome.
Also, some people just hate non-original versions of ANY song on the platform. "Waaaaaaaaaah...I want the Buddy Holly version!"
(Ummm, yeah. We ALL do. Unfortunately, it's not happening. This is an acceptable alternative to not having the song at all).