RenShep, especially in ME1, just swings way too wildly from position to position. ParaShep has a theme, a focus. But with RenShep, you get tons of contradictory positions. RenShep's only goal is to piss people off.

In ME2 and especially ME3, they did a much better job of making RenShep a more concrete and focused character. It's more what Renegade was advertised as in the beginning, the cruelty of doing a hard job, the cold equations. I mean, RenShep's still a jerk, but it just feels like their's an actual character there in the later entries.