I just dropped B. Molina for Doumit, I have several reasons for it.
1: I think Molina will not really improve on his stats from last year, now those stats you can find on the waiver everyday from catchers like Napoli, Snyder, Doumit, etc. People who drafted top 5 catchers will probably never pick up another catcher to sit on their bench, so in a 12 team league, 7 owners will be paying attention to the waiver/FA pool. There are 8 or 9 catchers that are statistically indifferent from one another, so you can drop without too many worries, and just go with whoever is hot at the time.
2: I like Doumit because he will not do worse than Molina at the least, but he has much more upside, and he may play outfield for the pirates, which instantly makes him much better (if happens). Outfielders who hit well, and have catcher eligibility, I think should be very coveted.
3: I am from Pittsburgh, and it does not hurt that he plays for home town. Pirates fans and sports writers hate Paulino, he just doesn't try very hard, does not play with much passion. I think management shares that sentiment. They are looking for reasons to not start him. Take today for example, in the game vs. chicago cubs, april 7th, Doumit was replaced by a pinch runner, Paulino showed up as catcher, with the scores tied in the 10th inning, he let Theriot steal second, then Ward singles, Theriot to 3rd, Pie pinch runs for Ward, Paulino let Pie steal to 2nd. In 12th inning, with the scores still tied, Paulino let Theriot steal 2nd AGAIN, then (this is important) Aramis Ramirez (who played for pirates before) sac flies to score Theriot... game is out of hand at this point.
No one likes Paulino.