I actually drafted this guy with my last pick after watching him in SL because my team desperately needed blocks and I have held him all of this time only because in the past I have dropped players only to see them go off the second half of the season so I told myself that I would hold and be more patient with my team and players in the future. To me it stings a lot worse to drop someone and see them help another team win a championship, than to hold someone and they be a bust. MRob has been a painful hold, but I'm glad I did now (obviously).
I will say this though. This year I told myself to be more patient with my team. Usually I would pick-up and drop ferociously throughout the season as soon as someone under performed for a stretch. It would end up hurting me because so many players I drafted, or picked up would end up going off later and I'd be stuck with some WW fodder. Sometimes I'd luck out in the end, but its a crap shoot. Now I treat it like the stock market, buy and hold is always the best strategy in the long run. Because of that I have had players who I would have dropped before, turn around on MY team, not some other team. Don't get me wrong, I try to keep a streamer spot though.
So my unwarranted advice is to buy and hold against your instincts, and MRob is a prime example of this because I wanted to drop him so many times for a hot WW pick-up who probably isn't doing anything now.