Since you wanted opinions:
World of Warcraft - 6.5/10
Free trial
I liked it but found it slightly boring, graphical style isn't entirely my thing. Play about 12 months or so on and off. Gold sellers are a huge problem now though, only quit it last month.
Lord of the Rings online - 7/10
Free trial
Gorgeous looking game, quite tame but excellent storylines much like most MMORPGs. I really enjoyed playing it but found grouping and pvp rather frustrating at times. These have both improved and I'll probably play it now and then since I have a lifetime subs - although I doubt I would without it! Still an excellent game, but somehow I didn't feel it quite filled expectations.
Tabula Rasa - 5.5/10
Futuristic style appealled to me, might end up being a great game as it has an excellent concept but too many half baked ideas. I'm keeping my eye on it for the future though.
Eve Online - 8/10
Free trial
Simply the only online space trading game worthing thinking about, enormous game with a staggering number of people on the one server "world". However it can get tedious if you don't put the effort in to learn how things work. I think it's essentially an OS inside and OS. Great game, nice skill system too and one of the few that doesn't have blatant character levels! Also unlike many online games expansions are included in the subs, so you never need buy one!
Dark Age of Camelot - 8/10
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Probably my second favourite game of all time, in it's twilight years now thanks to a development team that didn't understand or listen to the player base. Too many expansions but it is the same people who will be releasing Warhammer later this year. Best PvP of any MMORPG, best large scale battles of any MMORPG and I'd argue the most fun. It's still worth playing, but I'd suggest sticking to "classic" servers as the normal ones require a silly number of expansions to unlock all the content.
Ultima Online - 9/10
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Put simply the daddy of them all and still the best, although not worth playing due to the shortsighted milking of the player base with expansions that made little sense and ruined the experience. It's essentially dead now, still a few die-hards playing but I'd only give it a shot if you had a really awful PC and wanted something to play and were bored of World of Warcraft. Not only the first commercially successful MMORPG but it also had no character levels, skills were much more like Eve and open to the player to customise your character to stupidly detailed levels.
These are only my personal opinion of the above games since I began playing MMORPGs over 10 years ago, I will not justify them to anyone. 