I have a few.
As mentioned above, TORG (original). Box looked awesome. Materials read awesome. West End Games was awesome. Never could get a game running.
Also, GURPS. I loved the generic idea, and loved the Car Wars / Autoduel supplements. Never got a campaign running, and no one I played with wanted to generate characters for it.
The post-Gygax TSR run. I remember wanting to like Unearthed Arcana so badly, even when I knew it (mostly) sucked. But then they pumped out the hardcovers afterwards-
WSG, DSG, DLA, GHA, and
MoTP. I got them all, and even though all of them had decent bits here and there, they were just ... ugh (okay,
MoTP was fine). That, combined with WG7 were the end for me. I chose to skip out on 2e entirely (although years later I did go back and see check out the products, many of which were fine, if you're into that sort of thing).
The last TSR product I remember purchasing was the
Ravenloft: Realm of Terror boxed set, and thinking that it was incredibly stupid that they took a great module and made it into a campaign setting. Apparently, this is an exceedingly unpopular opinion.
