There's no doubting Graham's passion for the club and all round enthusiasm for the games.
Unfortunately, that doesn't always translate well into commentary (or co-commentary). So there were often long spells of loud yelling, and sustained rants about refereeing decisions etc. - over the top of actual commentary, so you couldn't hear what was going on. And, ultimately, the one thing a commentator needs to do is describe the action to the listeners.
I imagine that would make it difficult for any fan to commentate, as we'd all act as if we were in the crowd rather than with the necessary detachment.