I love his Day of the Tentacle critique, it's basically what my grandma would say if she reviewed games.... "I'm sure what you've created might be good, but it's not my cup of tea at all... In fact..."
it was my first real adventure game (i couldn't even progress through it because i didn't speak a single word of english -- it was trial and error until i understood what "open", "push", "pull", "pick up" were) so i absolutely LOVE the art style.
but i totally get what ron means -- art style is 100% personal preference.
Your grandma is a wise person - but of course it's the only way to critique a game made by people that you respect and that you worked with for a long time...