I'd give this game 6/7 maybe, but that might be a bit generous since I like the wow-like gameplay anyway

Good things:
Class quests, brings some story and feel alot better than the generic quests in most mmo-games. The voice acting also helps keep it fresh.
companions. I like them, alot of classes/specs dont function well soloing in alot of MMO-games and this helps those classes out quite a bit. (you roll a tank, bring a DPS companion so you can actually kill stuff in a reasonable amount of time, etc.)
Bad things:
General bugs/unresponsiveness, from personal experience some channeled abilities (i.e. Master Strike on Guardian) can do the full animation, without doing any damage, or triggering a cooldown. (this also seems to make them uninterruptable, so if you notice the ability does nothing, you still need to finish casting it)
Some parts of the game just seems to not be finished either. for instance I tried to get the +10 stats datacron on the republic fleet, but when using the "grappling gun" you need to get up to certain places I just got ported back down ( same for my friends), we tried this for about 15min, then gave up.
PVP:
I don't know how the server-client interaction works, but for some reason in pvp the lag seems to get out of hand sometimes, for instance after using my leap ability on an enemy, which roots them for 3 seconds I can still miss my aoe ability(melee range aoe) which I use directly after landing (while they are still rooted).
General:
Havent done any PvE on 50, just the lvl 49 flashpoint, thought the bossfights were pretty good, but nothing extraordinary either.