I see where you going with that, but I still believe that there's not many guys in the NBA who are better down on the low block. In fact, I don't think it's really all that outlandish of a comment. If your going to judge him by his past team's overall records, be sure you include all of the factors. In Boston, he spent his first few seasons as a raw player right out of High School on Celtic teams that didn't have a ton of talent. Trading Al for KG and signing Ray Allen is what vaulted Boston to contender status. It's not as Al had the luxury of playing with all of those pieces while he was a Celtic.
Then he was traded to the abyss that is Minnesota. If you wonder why Big Al didn't single handedly carry Minny on his back to a .500 season or two, go back and look at the rosters he played with.
If Al were a 30 year old vet who was supposed to be a finished product, I'd have a much more different opinion of him. However, I believe he was still only 25 when the Jazz traded for him and in my opinion had yet to play his best basketball.