SP discussion? I'll chime in.
I really wanted the Rannoch missions to be optional so that I could skip them and see the quarians die. I really do.
I don't do the Admiral Koris mission in my canon playthrough. I don't do the save quarian from varren mission in ME2 either. There are no options to kill a quarian in this game directly and I take every indirect way to do so.
I only do Tali's loyalty mission to increase her chances of survival and because she's the only quarian I can stand.
And when all those quarians boarded the Normandy, I wanted to kick them out one by one. The only quarian I like is Tali and my canon shepard (a fem shep) was a bit renegade towards her as well.
Edit: In the first ME2 mission with cerberus, I take Veetor with him and let cerberus mess him up. And when I meet him during Tali's loyalty mission, his reaction is priceless.
Edit 2: How could I forget this? When Tali says she got her squad killed by Geth on Haestrom, it was one of my favorite moments. I really wish Shepard had a renegade option there which was like, 'Lol, just what your race deserves'.