Well, you have to follow the forums. I'm mainly listening to rock and metal and I follow the releases. There's no rule for the quality of the vinyl depending on the genre. Most of the times they have better dynamic range. It's like with hdtracks - sometimes the releases have the same even worse dynamic range than the CD and sometimes they are quite better. Also I've said before
http://www.dr.loudness-war.info/ is a good way to check the dynamic range of a lot of different releases and see, which has the better mastering. As far as the vinyl rips go, it's a bit hard to know if the needle drop will be bothersome or not without actually hearing the rip.