That doesn't even make sense, PS:T en BG2 are both AD&D games using the exact same game engine with a slightly different UI
And as I mentioned (or at least implied), I played them years apart. I may have been in a different mood / mindset when I tried PS:T, or maybe I had played enough other games since the BG 2 demo that I had gotten used to dealing with issues like those which put me off originally. At the very least I paid for PS:T, so quitting, if I had wanted to, would have meant wasting $10, or so; it cost me nothing but a little time uninstalling the BG 2 demo.
The beginning of PS:T was much, much more interesting to me than the start of BG2 (for example, I wasn't a fan of the cliché Minsc appeared to be, or his reaction to how you get him out of the cell, while Mort and the Nameless One were intriguing). A strong story can make up for other issues, and as I mentioned earlier, I didn't find anything in the BG 2 demo worth giving the combat a second shot.