Is it?
Did he not get Swansea promoted from League One and set them on their way to the Prem playing a slick and stylish brand have highly-lauded football?
Did he not keep Wigan up under significant budget restraints compared to the teams around them for three years playing an ambitious style that, while not always proving fruitful, eventually won them the FA Cup which they'll probably never win again in most of our lifetimes... yes they got relegated but the above alone more than balances that out.
Did he not, after 11 years under one manager that in the end had stagnated slightly, come in an bring the 'school of science' back to Everton introducing an exciting brand of football, buying and loaning exciting and quality players as well as making youth an integral part of our team while all the while getting a records point total for us in the PL era which this season could possibly be enough to win the title...
In his second season, despite being bogged down domestically, did he not - in his first season ever in Europe as a manager or player - get us further than any other British team and hammer the likes of Wolfsburg and Lille that caused English teams so much trouble both in the past and this season...
He has his faults, definitely, but he is far from 'kak'