I have all three of them, but I never paid retail for any of them. I do think the $75 neighborhood is too much for any single mini that I can only use in ridiculously high-powered games, but I'm still glad I got it at the price I did (can't remember the details off the top of my head, but I got it for around $30).
I do agree that it could use some more tonal ranges, the claws, teeth, and some of the horns at least should be different colors. I'd like to see more depth in the underscales though. The pose does look weird, but it's never really bothered me that much. Still, I'm satisfied with the product... Satisfied, but not impressed either. Besides the scale, it has the same quality as all the other D&D miniatures.
I am gearing up to run a game where epic-level characters are going to fight all the gargantuan/colossal dragons, so I'll get some mileage out of them.