Nah lol, i was lvl 30 when i stopped
I've found a lot of people share this sentiment and what it boils down to is them being unhappy with the class they chose.
SWTOR classes have rollercoaster phases. My assassin is lvl 46 now. I was doing well 10-20, suffering 20-30, doing ok 30-40, now I'm facerolling 40->
Guardians / Juggernauts, Marauders / sentinels, snipers / gunslingers all say the same thing on the forums...they go through dips or they feel underpowered vs their friends ... and unsurprisingly all their friends are either sorcerer/sages or mercs/commando's.
The same was to be said of rift and early aion days where the casters were cleaning up.
I'll admit Swtor isn't for everyone. Fortunately KOTOR 1 & 2 were my favourite RPG games of all time, so this feels like KOTOR 3 to me, with MMO style combat. Me gusta!
In WoW I played my rogue for 3 years flat without so much as bothering to create an alt. I can see myself wanting to create 8 chars in swtor to experience all 8 class storylines.
What will drive people back to wow is the buggy UI, terrible GTN layout, unrewarding skills, unbalanced PVP system ... however, those can all be patched out ... what really keeps it together is the freedom zones. Just like you had Shattrath / Dalaran / SW & Orgrimmar.
Sure there is the fleets, but there's no real staging area where people show off their weapons / mounts / whatnot. Also there is no inter-connection between planets. In WoW you'd meet more people between 2 big areas, in swtor it's a case of branching out and returning to the same quest hub.
This isn't all bad, because the beauty of going to planets is that there is effectively limitless real estate for expansions. Not only can you add quest hubs to existing planets, but you can simply add more planets without upsetting the geography of the game. WoW has a serious real estate issue, resulting in them having to phase the crap out of quest hubs.
Lastly, what SWTOR will eventually need is alternative leveling zones. Right now you have to do the same planets in order to progress. If there was alternative areas to quest in as per wow, it wouldn't feel so linear.
The idea of the warzones are pretty awesome. Infiltrating bases, annexing cannons to blow up the other team's spacecrafts instead of just 'capture the flag' and lastly as much as we hate huttball, the premise of intergalactic american football in a death gauntlet for the hutt's entertainment is a pretty rad idea. Especially being able to battle against players of your own faction.
In closing, I _LOVE_ space battles. Upgrading your ship and doing missions is absolutely crazy fun. If they ever incorporated group missions as flying "squadrons" it would just be too much for my brain to handle.