I think Clendening having played on no less than 7 teams over the last 2 seasons has to be taken into account. Gotta be tough for anyone to get situated under those conditions. Still, there's some encouraging stuff if you look through his advanced stats.
I don't know if thats accurate or not (though probably not far off) but theres been a reason for that.
Seriously, this guy is Jeremy "Jet" Morin's spirit animal.