Seems like a completely subjective assesment... Even if he is, the players don't seem to be too impacted by it.
Tata has gotten positive results in every big game this season, has gotten Alexis, Pedro, Cesc, Valdes, Pique (others have improved too, but not to such levels) performing at levels either unheralded or not seen for a long time, he's tightened up our defense very well, he's helped Neymar have a great first season (even if he has been meh this calendar year), he's made sure we're still in contention for every trophy we were in (and already won one), and he has yet to make his personal impact on the team in terms of transfers. I think that there is hardly anything more anyone could have done in their first season and I certainly disagree with the elitist "former Barca players for managers" approach. What our club needs right now (IMO of course) is stability, a constant in a whirlwind of change, with Xavi and Alves fading out of the starting XI, with Puyol and Valdes leaving, with the whole deal with Rosell resigning, I think the last thing we need to add in a new manager on top of that.