Yes, personality flaws are a problem. Some people are selfish with the keyboard, some always want their ideas to be implemented, some don't coach well, some don

Yes, personality flaws are a problem. Some people are selfish with the keyboard, some always want their ideas to be implemented, some don't coach well, some don't have good personal hygiene, etc. However that said, I still feel pair programming is the best way to do it. Productivity is a lot higher when pairing.