Andersons fights entertainment value is hit or miss, he's been responsible for some of the most unbearable fights in UFC history, but he also has a highlight reel second to none in the sport. The Franklin fights, even though they were total beatdowns, were very entertaining. The Leben fight was a great one aswell. The fact that he was far superior to his opposition for the majority of his career shouldn't be held against him. It's just hard to find a fighter out there on Andersons level, that you can stick in the cage with him and get a grueling, exciting stand-up war. The Belfort fight had great potential, but we all know what happened there.
Is he the all-time most exciting fighter to watch? No, that's BJ Penn in my opinion. But he is up there, and he is the most entertaining of the current UFC champions. He just have that aura about him, that you earn from wrecking your opposition for years.