On Weezer - the Blue Album is good, but Pinkerton is far better.
I know I'm late to this thread, but...
My top 10 for the 90's (not necessarily in order):
1. Social Distortion - Live at the Roxy
All the greatest songs by my favorite band, accompanied by the between-song ramblings of Mike Ness. Perfect.
2. Quicksand - Manic Compression
Very underrated band, not very well-known, but really good. Sort of similar to Tool, but without the pretentious edge. Self-titled first album is also really good.
3. Helmet - In the Meantime
The first band to play around so excessively with drop-tunings, stop-and-start rythyms, guitar feedback, etc. Way better than all subsequent bands who turned these into cliches.
4. Mighty Mighty Bosstones - Let's Face It
Best album from the whole mid-to-late 90's ska craze.
5. Pantera - Vulgar Display of Power
I'm not usually into metal, especially stuff this heavy, but Pantera is the exception.
6. Red Hot Chili Peppers - Blood Sugar Sex Magik
Everyone of my generation owns a copy of this album. Helped define "alternative" for the 90's.
7. Jawbreaker - Dear You
I would actually put this as a toss-up against their previous record, 24 Hour Revenge Therapy. Excellent band.
8. Rancid - Life Won't Wait
They finally took ripping off the Clash as far as they could take it. While Tim Armstrong sure ain't no Joe Stummer, this album is still better than a lot of the crap that came out in the 90's.
9. Wu-Tang Clan - Enter the Wu-Tang (36 Chambers)
Probably the only rap album released in the 90's that I liked.
10. Rage Against the Machine - Rage Against the Machine
Are they flaming leftists? Yeah. Do they know how to rock? Hell yeah. So I'll let it slide.
Honorable mention: The Johnny Cash American Recordings series (some of which were not released in the 90's).
I love Pinkerton, so it definitely gets an honorable mention from me.