I didn't blame Tubby for losing guys like Royce and Paul Carter, those were basically out of his control in my mind (similar to McNeil and Lofton to an extent). It was the losses of Devoe, Cobbs, and Iverson that could be partially blamed on Tubby as they primarily seemed to be based on playing time and Tubby's coaching style. Devoe and Iverson, in particular, were already solid rotation guys that really hurt the team when they left. There might have been other off-the-court issues with Devoe that contributed to his transfer as well, but that one really killed our backcourt, especially once Nolen became ineligible.
The Martin transfer to me reminds me a lot of the Cobbs transfer under Tubby. Seemed like a kid that wasn't getting playing time and was home sick, so he bolted early. Hopefully losing Martin doesn't end up being similar to that situation however, because Cobbs turned out to be a helluva player at Cal. For the time being however, losing Martin, Lofton, and McNeil don't seem like a big deal to me in terms of talent. Those guys can be easily replaced by most 3* recruits or a transfer of our own that is brought in.
As far as Pitino's character assessment during recruiting goes, I'm fine with what he's doing. Teams like Minnesota have to take some risks to get high-level talent. We're not at the level of Duke, where we can just avoid all potential toxic issues and recruit only kids with the highest of character.
The difference (at least from what we hear second hand) is that in the instance of Cobb- he stuck out a year, thought Tubby was crazy and so did a number of other players. Martin's decision appears to have the backing of Martin only- as far as we know. A good indication of this is how the team played last night. They came out with a ton of zip- hustling and moving the ball as well as I have seen a team from these parts in a long time. That speaks volumes. Had they have gone out and pitched up a lethargic looking win- I'd be more concerned.