I have played SWG and MxO. MxO has a really nice fighting system but thats pretty much all there is thats nice. The playerbase ruins all the live events due to players yelling stuff like "OMFG M0ph3us I h3@rt choo!!!1!1." and dancing without clothes on. Star Wars had the potential to be great and still does, that is, if the dev's gave a shit, which they don't. Also, SWG is almost unplayable with 512 ram since the combat "upgrade."
I have not played Everquest and dont know anything about it. I have heard WOW is fun but the alot of the playerbase is very immature. I don't know for myself though. It's just what I have heard. I can't really recommend anything thats worth the money you pay monthly.
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Even though I have not played it yet, I just got City of Heroes about a month or so ago and it was nominated for best MMORPG so maybe you should look into that game and check it out.
I have never played a MMORPG before so I can't really tell you anything specific about any of those three above but Matrix Onine was my second choice next to City of Heroes when I was choosing which one I should get.