just started Rift in f2p - pretty good so far with a lvl 51 Rogue. plenty of people online. f2p model is ok, you get access to all areas, most classes. class system is interesting/unique because you can build any hybrid class you like. however, story is dull/lacking. also it is lame that you cant use auction house which is pretty important in any mmo! you can eventually when you save enough game cash to buy Rex which will giv you access - I think they should have f2p access to AH just limit how many listings you can have - seems fair. dungeons so far have been pretty standard just nuke it, no real strategy or anything special, maybe that will change at lvl 60 - although not sure. another thing I don't like is the crafting. I don't trhink I will grind high lvl dungeons etc... not my thing, but I will try new classes - healer/support probably next
SWOTOR is very good. played at launch and had 8 toons all max lvl. universe is cool, try both the story lines empire and rebel. I didn't like the space missions in the game. it's f2p so defo give it a try. I stopped playing coz of life and I get bored of grinding the same dailies, dungeons after a while. why I prefer to lvl different toons and discover new stuff or playstyles. Scoundrel was my favourite class, at the time everyone was rolling sith sorcerers or jedi shadows - I played them and bit OP but still good fun. dunno how this has changed since early days, prob needed a rebalance imo
Age of Conan. very underated imo because at launch lvl 40+ content was lacking but this was addressed. I think it had the best combat system of any mmo I played. graphics were awesome and classes cool, I miss my bear shaman (a melee healer!). Tempest of Set was amazing DPS and heals - bit OP, but great for a newbie. f2p now so give it a try, not sure how active pop is.
LOTRO and GW2 were good so I won't criticise them, I just got bored with them rather fast. Lotro was just nothing special and I didn't like the classes in GW2
you got plenty of choices and it won't cost you anything to try. have fun