As far as KOTOR 1 goes, everyone ought to play light side because the sith are so moronic. This is sort of like the thread about them always underestimating you.(These points aren't really intended to be taken seriously)
1) All of them seriously need a psychaitrist, as they each think that they are strong enough to kill three obviously superior jedi.
2) Malak is a total dumbass. One example is why he sends Calo Nord after you? If you could beat him before you were a jedi, what were his odds supposed to be after you'd become a jedi?
3) Revan's ship really sucked if Malak could nearly kill someone on its bridge in a surprise attack before anyone knew what was happening. Aren't Star Wars ships supposed to have like sheilds and armor and stuff?
4) At least Palpatine and Vader built their own Death Star. Revan and Malak didn't build the Star Forge, they just found it lying around waiting for them.
5) Malak knew EXACTLY where you were going to be at every star map? But does he blow those planets up? Does he reinforce those planets with legions of sith minions? No, out of the two planets that he blew up, neither of them were ones that could have hidden his super factory forever. And he only sends two incompetent guys after you.
6) Malak knows that you are out there, he knows you're going to get to Korriban eventually, he's sending guys after you, and he knows who you are once Calo tells him when you leave dantooine. You'd think he would give your description to his minions on Korriban, since the whole planet works for him, and tell them not to let you in.
7) Out of all the people Revan could have picked for an apprentice, he picked the dumbest idiot in the entire universe. The only worse apprentice he could have found would have been Julhani.
The Leviathan pulls you out of hyperspace, why don't they have the presence of mind to do the same thing when you try and get back into hyperspace?
9) If Malak had fought you in the room at the same time as the regenerating droids, you probably would have lost. But that would be asking too much of him.