I'd like power from 3B as well, but it's not like Pablo is a major power source, even when doing well. He's only had over 16 HRs twice (last time in 2011) and over 27 2Bs twice (last time 2010).
Marco has hit 20 HRs in his last 1,000 PAs in the system, including 9 in 356 ABs last year. Marco has 58 2B+3B in his last 1,000 PAs as well. That's not far from what Pablo gives us. Pablo has 13 HRs and 27 2B+3B in his last 500 PAs (26HR/54 2B+3B pace) and 29 Hrs/56 2B+3B in his last 1200 PAs (24 HR/50 2B+3B pace for 1,000 PAs).
I'm not happy with Marco's defense at 3B either- not that Pablo has returned to his old decent-defending self (yet?).
As much as I love marco, I'm sticking with Pablo. I'll give him a long leash, too. At least his few hits have been big ones!