There are, of course, variations in quality between films, but I think that poor quality processing and printing is sometimes a bigger factor in producing disappointing results.

I've recently found a good quality lab, handles anything from 110 to professional 20x16, and have been delighted with the results I've had from all films, even cheapy C200 and Kodak Colormax.
Ektar and the Fuji equivalents are even better...but not that much! And I'm very critical.