I think it was the only ending possible. TNO deserved to be punished, he accepted that himself.My views go with the "there will never be a comparison" after I played it and finished it I hated Black Isles for what they put the Namless One through and it isn't a happy ending no matter what you try I mean the simplest solution would have been "right I'm here to find out things now I've found out who I was in previous lives I want to go home with my friends" but when you try that option your motality says yes you will leave after I kill you
I've also got to say that I believe that the reason that it didn't sell well is becasue the general public is stupid and unthinking I mean Diablo II is fun to play, but only if you don't want to be force to think, Torment forces you to think in different paths to those that you normally do No offense to Half-life either I like I've played it and I want half-life 2 but the reason that it sold is because how much thought does it require to shoot something or use a switch or lever or something, the puzzles are much simpler and obvious, and there's less reading in fp games
Belive it or not PS:T sold more than fallout.