I think psut you are spot on about being rash, but a classy player learns and Zaba has shown that this season. I sure have noticed it, but Zabaleta is far more selective in when to go in for the hard challenge etc now then he was at the start of the season. Every game he is improving, and he is rapidly becoming our argentinian beast.
I can't agree he is naive positionally though- perhaps when playing in midfield, but very very rarely when at RB. He got done by Young once last night, and with the form he has been in this season that is a sensational effort. He lacks a bit on speed but he has an excellent footballing brain on him. But to think he is only 23- he plays at a standard imo of someone who has had several years of premiership experience, i.e. a 28 or 29 year old.
I think he is the signing of the year to be honest for us, though overall I'm more then happy with all the signings we have made (Except for TBH and Berti). His attitude is top notch, he is as hard as they come, has plenty of passion and seems to be really enjoying playing for the club.