OK then:
1 FONV/FO3. I just can't decide between them. FO3 had more initial wow factor, better atmosphere and a setting that appealed to me more, but NV had more longevity with the different factions, more in depth companions etc.
3. Oblivion. It's...it's like a DnD world brought to life that I can explore for myself at my own pace!
4. Neverwinter Nights. Only top down (isometric?) non ARPG I've ever liked until very recently, but I liked it so much it kept me buying others for years on the of chance they were as enjoyable.
5. Skyrim. Like Oblivion but the world did very little for me and fuck the chosen one bullshit.
6. Guild Wars. Nice take on Western fantasy. Familiar, but different enough to be interesting. I even remember the story quite well. Then they brought out the expansions that focussed on an Eastern styled fantasy nation/area and then an African one. Was great to see something different even if I didn't finish either of the expansions.
7. Guild Wars 2. An improvement in many ways over one, graphically, mechanically etc but the story felt far less compelling and didn't reintroduce the Eastern/African settings.
8. Neverwinter. Nicely actioney. The main story has a small well created world, more like a single player RPG, which is basically how I played it, so it suited me fine. Could have done with a lot more variation in the look of your stuff though.
Really now we're getting into "it was OK" territory. Stuff that maybe had one or 2 things about it I liked but generally fell down for various reasons.
9. Neverwinter Nights 2. Felt clunky and buggy as shit, had to restart this fucking game about 4 or 5 times and in the end just gave up. Buuuut...I actually liked most of the characters. Khelgar, Qara, Sand, Neeshka. Always in party.
10.Er...dunno...Maybe Shadowrun, primarily because it took me back to playing CP2020 PnP when I was a kid.