I think to answer the question you need to separate them into 3 sections.
1) Which do you think were the shiteist?
2) Which did u think put in least effort?
3) Which did you think were just complete twats as people, as and when you met them?
For me, in 1) the likes of Trevor Christie took some beating.
2) Probably Macmanamanananan although that's just off the top of my head. Rodney Marsh would run a close second, but he had the skill not to need as much effort.
As for 3) I've met quite a few City players in my time, and I have to say, they were all top class. Although not a City player I met Peter Shilton once, my hero as a budding goalkeeper. He spoke to me too. He said "Get out of my way". Twat.