They are not compatible. Their senses of humour would be a mis-match.
Andy's dry humour and self-deprecating tendency amuse Federer, and it goes without saying Fedal have lots of chemistry.
I remember one time Djokovic played Basel and lost to Federer in the Final. The host asked Djokovic to interview Fed. He asked Federer "how do you feel today beating me?"and Federer smiled and replied "very good". The whole exchange was obviously meant to be a joke but it came out very awkward and not funny at all.
Absolutely nailed it. People love to overreact and created drama, but I'm sure it's just a matter of feeling.
I feel the need to name one other person. Roddick. His humour was a little bit dry, kinda like Murray's, and you can still tell he and Roger really get along. As a matter of fact, Roddick was the only person to actually call him a selfish bastard on an interview and get away with it.
Djokovic, on the other hand is either forcing himself down people's throats like "you NEED to love me" or just ripping shirts and pulling faces that would make anyone uncomfortable.