You can recognize that something is trash and still enjoy it as a guilty pleasure. The vast majority of isekai are just garbage, but that doesn't stop me from reading three or four chapters a night as I lay in bed waiting to fall asleep.

It's okay to like something that you know isn't good for you. I like energy drinks even if I know that all the chemicals are doing me no favors and each sip is taking me one step closer to a kidney stone.