They’ve been criticized of rushing and skimping on accurate / ethical review practices. There are also allegations that LTT is a fairly toxic work environment, but, the former has more concrete evidence since the janky reviews were recorded and uploaded.
And on a more subjective note, a lot of people aren’t really into the way that Linus behaves on camera. I’m in this camp. I find that he often comes off pretty arrogant and belittling when he’s interacting with his staff on camera.