How so?
Looking at K1, Revan built only those powers you chose to according to the game rules. The One mentions Revan using force lightning on his first arrival on Lehon, but that's scarcely a surprising display of DS power. Indeed, most of Revan's powers seem very conventional, and it was more his choices and tactics that set him apart. He was a good strategist on the basis of what the Mandalorians, especially Canderous, tell us, and you could conclude he was a good duelist since he defeated Mandalore and Yusanis. However, neither of these speak to his force abilities.
I dont think Revan is impressive in terms of force powers, but he is so in tune with the force you could swim laps in it. what sets him apart is his tactics,choices, and finesse style of combat.
And to say the sith possess more unique abillitys is a hilarious statement. They might possess more straight forward ways or ways involving hunger and corruption but light jedi have to power to revilatize,shield, and heal their wounds without using something as their source like a force drain. However I think that Force Drain/Death Field are some pretty formidable powers I mean sucking the life out of something.. its just the thing is is with power comes responsibillity and I mean most people who use those powers turn corrupt.