I can see merit in both your opinions.
Dave did have a career that many would dream to have - 207 NRL games, State of Origin representative and played for Australia (once or twice, sure).
That said, he probably didnt live up to his full potential for a consistent tenure - At his best, he was a wrecking ball and a fantastic player.
As many have said, he carried a bit too much weight and at times his effort has been questioned but a bit like Tony Williams, had the potential to be a long term destructive player.
I hope for him that he can look back and be proud rather than have regret as I could be wrong but I dont think he was a dickhead or a bad dude.
Congratulations on a great career Dave.