...I didn't like Ultima 7.
The computer I played it on was epically slow, and the humongous world detracted from that, as well as the 'mouse only' way to play. They removed the parser thing from 4-6, which I really liked (Ultima 4 was the game that got me into the RPG genre to begin with). I think I played it for a few days and the magic didn't seem to be there.
...I didn't like Ultima 6.
I didn't like how they changed battles, so many of the dungeons were annoying to go through, and you never had to go through one at all in order to beat the game..making every dungeon a waste of time. I thought the Gargoyles were really cool though, the Draxinusom (sp) king of them was neat along with how they talked. The game crashed a lot on my Amiga, but I did go through it a couple of times (finding Nicodemus to get the Unlock Magic spell really pissed me off, though). I didn't really care for the level of interactivity that was added, and the Pickpocket spell also added to the "dungeons are pointless" factor, of course along with the instantly-warp-all-over black Moon Stone.
I have Ultima Collection, but really only play Ultima 3-5 on it. 1 and 2 play too insanely fast (no idea how to do the moslo thing), and 7/8 don't want to run with my mouse or something. I'd like to try 7 again, as I've heard that it and/or Serpent Isle were really good. I'd probably be able to play it now. 8 sucked though.