I realize that this post is very likely to get bumped way down, just now, by the sheer waves of posts from people upset that they can't get into a game before it's even launched - but hope springs eternal.
I know there are WoW vets out there. I don't want to create a wow-bashing session, but I'm just going to list a few of my frustrations with WoW, just in the sheer hope that Bioware has learnt something from that game - and will try to take a tweaked, different approach to the same issues.
Feel free to add your own thoughts!
1. Current content matters; all else is obsolete.
This is a big one for me. In WoW, the window dressing on the hamster wheel has become way too threadbare. I'm not saying that there should be content that only a few measely percentage points of the population get to see, but instantly obsoleting 'old' content by handing out better gear like candy isn't good either. What'd be wrong with having to work your way up through content, as you develop through skill and gear?
2. Grind, grind, grind.
Valor points. Daily quests. Reputations. Nothing kills enjoyment more than forced repetition. Of course, some repetition is absolutely necessary, but I would adore if Bioware could be be sure to include content that a) isn't absolutely necessary to advance your character's gear level, and b) doesn't need to be run 307 times to garner any benefit.
3. The difficulty curve.
WoW's is out of whack. Plain and simple, going from a god-mode leveling experience to a crushing heroic instance experience is disasterous. WoW has made some strides in creating different difficulty settings, lately, with their raiding game, and I won't diss that - except to say that they've created another layer of content (LFR) that people will, since it hands out upgrades, feel is absolutely necessary. Goes back to point #2; am I wrong to feel that simply getting to SEE and KILL the bad guy should be enough motivation for very-easy-mode?
4. The UI.
Yes, I'll say it. Wow's default UI sucks. It wouldn't be such an issue if the gameplay didn't require monitoring so many timers and procs, but it does; and so addons become absolutely necessary. In my opinion, WoW's gone a bit proc-and-timer mad, and I hope SWTOR doesn't go so far in complicating gameplay. Yet, I know that UI features are very important.
5. Change with your player base..
.. but don't roll over.
I know folks are going to criticize me for my points. Feel free to. But please don't get bogged down in that; list things you think and hope TOR can do better!