i feel like this is a problem that crops up when youre working in the field youre criticising; if youre a writer, critiquing tolkein gets difficult because Youre Not Tolkien. how is a painter supposed to crit picasso? who do they think they are??
but critique is a really important skill, and everyone has flaws, plus theres all that subjective stuff. if youre able to look at a piece of work made by someone significantly more experienced than you and properly evaluate it - see the flaws, see the merits, see the stuff you wouldnt do, imo thats an important part of developing your taste, style, and eye as a creative.
that said, i really feel you. when i do reviews on letterboxd or goodreads i need to really push myself to not give into the peer pressure of the rating a film 'should' get based on the creator, the works reputation, or general consensus. but forcing myself to stick to my guns and give the cabinet of caligari a 3.5 makes me take my own experiences with media seriously. if you just assume that these more experienced artists just know something you dont, it makes it easier to not properly engage with the work, and rather youre left shrugging and saying 'well, its a classic. i must just be stupid.' you aint. some shits overrated, and everything has flaws. (caligari isnt overrated ftr. i just didnt enjoy it a tremendous deal)
that said, i kinda feel more secure criticizing bigger creators. like, if everyone loves shakespeare then im a bit cheeky and anti establishment when i say hamlet drags (though its more that kenneth branagh drags), and nobody gets hurt. criticising creators more 'on my level' is a lot more dangerous, emotionally. but neil gaiman, steven spielberg, jk rowling? they got money, they dont care.