My Shepard is a bit of a hybrid; mostly Paragon, enough so to make peace with the Quarians and Geth, but still punches news reporters and kicks merc leaders off of skyscrapers. And I ALWAYS do the Renegade interrupts; they're a lot of fun.
I actually only recently bought the trilogy set; before I was just using Genesis for ME2 and transferring that save to 3. Just finished my second playthrough of ME1 and thus my second time going full paragon. Been thinking about whether I want to do a THIRD playthrough as the same Shepard (so paragon again) on higher difficulty level for the challenge or if I want my next playthrough to be as a full renegade. I've never actually done anything renegade except one maybe two interrupts in ME2, both acquiring "Archangel". Gotta say, punching the reporter does sound like fun.
Renegade shep can be a complete monster in ME3, I played through a full renegade Shepard in 3 and wow I just wanted to get up off my chair and just turn off the game, then just walk off in shame because of it