I really loved IDW's current Ninja Turtles series, I thought it was a really great take on the old TMNT lore with a modern update and some changes that worked.
I read the first 50 issues and I felt it was a good point to stop. I felt the "Vengance" story arc that ended in 50 really felt like a natural ending point.
Not sure if anyone else bailed on the series around that point, or if you kept going and stuck with it through today?