Something like that, yes .
But it simply doesn't make sense that in for example KOTOR 1 or JA, you have to kill everyone (or almost everyone... at least you can make it so that you don't need to fight/kill the Sith on Korriban). There should habe been at least a few situations where your enemies were convinced to join you. Take for example the Sith in the Rakatan Temple on the Unknown Planet. You can tell them to "bow to the True Dark Lord of the Sith", but they simply reply that they serve Malak :/. Which in a way doesn't make too much sense to me.. If Revan was able to survive and fight this far, then shouldn't people get that he was stronger than Malak? But as it went, Bastila is the only one that notices this.. :/.
No, I defintively think there should be at least some of the sith who'd choose to follow you if it came to a showdown between you and one of the three Sith Lords (and you won, of course ^__^).
Absolutely!
I always hated that all the Sith were completely loyal to Malak. Why not betray Malak? Revan was always stronger!
And that is why we all love Bastila. She recognized Revan's true power!