I haven't read any reviews of it, so I don't know what they say that would drive you away from it. When it first came out it was clear that the game wasn't finished. Having worked for Sony before I was expecting this - they have a tendancy to force a launch on unfinished products =P There was a time when the game was so filled with crash to desktop locks that my husband and I almost gave it up. Most (not all) of those issues have been fixed and the game is just awesome now. The graphics are really nice =)
I guess it depends on the kind of MMO experience you are going for. You will not be able to solo your uber twinked toon through the game, it just can't be done. People have complained about a lack of content, but I think these people aren't trying. I like a bit of story to my quests, and most of the major questlines have a little bit more to them than "Kill the big bad boss at the end". There are three continents, I've lvled my toon up to 40 (max 50) and have rarely left my home continent and it looks like I still have enough content to get me through 50. Once we are up to 50 apparently the content drops off, but thats ok because both my husband and I are going in lvling up a few different classes because they all seem so interesting to play. The crafting is fun and player crafted items are in demand. Diplomacy is a cute little card game, but they need to add more content here because it gets boring to grind it up.
You can buy it pretty cheap right now so if you give it a go let me know