After playing LOTRO for 4 years I base nothing on launch. LOTRO was plagued with a good amount of bugs when it first came out, and rather little content. It had a nice consistent playerbase though.
Turbine fixed a good deal of bugs added some instances and raids and 4 years later, their playerbase has consistently grown. Unheard of from an MMO, but whatever.
I plan on staying in SWTOR for awhile. I have confidence that Bioware will make some corrective actions, the little that are needed.