I think I have a low completion rate. Those peeps down there in my sig are still my only 50s in HC. I know I started a couple of Sents that never went anywhere past maybe 20, and I seem to have an aversion to both melee and ranged fighters who do nothing but pew-pew-pew and smash-smash-smash; my highest level of any of those is an MA scrapper who was definitely fin, but from whom I've drifted away a bit about the time he hit 37 or so. But I also have maybe twice as many incompletes as I do 50s right now.
I know I have been playing less too, it's like after I completed Midnight Bridge (there in my sig, again) I sort of felt like "here's a place to stop and look around and think about what do I wanna do next?" And then found out I couldn't really think of something to do next. I've level a few alts to something like 28, 37, 40 since then, but I'm not playing nearly as much (the Halloween event may bring that time played back up, that always excites me).