FYI I do have a few hoodies from them, sometimes they sell them on sale at the Capital One Arena for 40% off. It's on sale because it's conference championship gear, not because of poor quality. I ended up getting one of the Eastern Conference championship hoodies last month and it's of good quality.
So, is it safe to suggest that the quality of their clothing is way below than those of Nike, Adidas, Under Armour?
I get a ton of Nike / Reebok on sale crap all the time to wear, sometimes not involving my team, and I would say Fanatics is a tad inferior, some of the Reebok hoodies I got were smaller as a medium but the material felt nice. That isn't to say Fanatics is bad though, it seriously isn't. Again, I've purchased plenty of gear from them including t-shirts (Vegas strong shirt...before Vegas made the final) as well as their Stanley Cup champ hats and hoodies at the team store. I have had zero problem with the quality. The only issue I had is that sometimes it took a while for their stuff to ship.
People act like the paint will wear or the material will disintegrate which is completely false. "I wore my fanatics shirt for 2 weeks and it disintegrated into nothing! 1 star!"