Their relationship seemed based on quips, sarcasm and a "don't do it like that, do it like this" or, "I'm much better with a lightsaber than you", kind of approach.
More like a bad marriage of 'inconvenience' than a genuine friendship.
I guess I was expecting more of the Biggs/Luke type friendship, from the way Alec Guiness portrayed Anakin to us originally in Star Wars.
Old Obi was a conniving old bugger though, so he may not have been telling Luke the "whole truth" of how good a pal he was to his dad.
I do agree with D Cracker, that the comradery that should have been there throughout the PT was severely lacking, and the way the
Obi/Anakin was handled for the PT is just one example.