I'm on Stormrage US.
I've never enjoyed doing low level 5 mans. I guess when I lvled the first time I was a complete noob and so where most of the people I grouped with. I found those groups horrible and prefered to solo. I had no issues leveling with minimal instance runs. If you level fairly quickly you outgrow the gear you get from instances so quickly its hardly worth the effort.
I still dissagree about the level playing field

When TBC launches, established guilds aren't going to dump their existing player base just because there are a lot of new players available with similar gear. We have learned though bitter experience that good players will always be good players regardless of their gear. We have had people with exceptional gear who simply cannot perform in complex fights, and people with lousy gear who pull out all the stops. A guild will always pimp good players they find, so gear will never be an issue.
All of this assumes that the OP would even be interested in "end game" raiding

. Play the game, have fun, make some friends, maybe join a guild, and see what happens