Well... here's my uneducated opinion on these three albums:
1994 - S/T
The only Motley Crue album without Vince on vocals. This is a pretty decent album. In fact, I'd say it's a pretty damn solid album with the exception of the first couple of ballad-ish/slower songs. The music is good. Corabi's vocals and lyrical delivery is good. The whole album is far better than I remember. BUT... it sounds nothing like Motley Crue. If they had just called the band S.L.M.C. or something like that, it would have been perfect. I will be slipping this one onto my phone and a drive to use in the car and get it back into the normal rotation. While I'm sure I won't listen to it as much as the first 5 albums, but I will definitely be getting into it more and more.
1997 - Generation Swine
I don't know what really happened between Vince and the band in the early 90's (I'm not sure anyone knows at this point), whether he quit or was fired and/or why. I have seen him say in interviews that he has never listened to the 1994 album because it doesn't interest him (or something like that) and that the direction the band was going at the time was nothing he wanted a part of (again, I'm paraphrasing). Then he came back to the band in '96 and the band put out this absolute turd of an album the following year. While I could understand him saying he didn't listen to '94 S/T at the time, I'd understand it. But 25 years later, if he still hasn't listened to '94, he's a fool. If he (or anyone else in the band) thinks that Generation Swine was even DECENT, they should have been drug tested, repeatedly. There are a couple of moments on this album that i thought "this isn't as bad", then the band just shits all over the song a minute (or less) later. G.S. is easily the worst thing the band ever did, it's not even close. The music/songs/lyrics are lame. From start to finish. The only decent track was the weird, sped-up mix/remix/rerecording of Shout at the Devil.
I haven't listened to GW in years. It's going to be several years before I listen to it again, guaranteed!
2000 - New Tattoo
The first/only album without Tommy on drums as he had left the band a year earlier. Right from the opening track, this album sounds like what SHOULD have been the band's natural progression and follow-up to Dr Feelgood. Not saying that it's as good as Feelgood, it's not even close, but the songwriting style, the musical style, it's much more like classic Motley. Overall, I'd say that I'm indifferent to this album. I could listen to it every once in a while and not be bothered by it, but I probably wouldn't seek it out very often (as I already haven't done much in the past 18-19 yrs).