He's 1700 so... yeah. Some things he knows, and some things he'll be clueless.
Ideally you have a master to teach beginners, but it's not like 1700 is so bad.
Anyway, so my answer is it's somewhere inbetween. He's not particularly bad or good. I have seen him say some dumb things, but some of the things people have raged about in comment sections have been totally fine.
i was watching chess videos with mike kummer on YouTube. he seems like a good player but many ppl in the comments say hes a horrible teacher and that his advice is bad.