From what I see in Russian socials, 80-90% hate him with a passion (funny enough, mostly people who were either born after he left the scene or were toddlers during his time in the office).
While 10-20% acknowledge that, while definitely not perfect, he accomplished a lot and ending USSR that was about to collapse violently in a fairly peaceful manner should be a credit to the man.
He had a vision of Russia becoming a reasonably "normal" Western-like society. It is unfortunate that he wished for the impossible. Impossible for all kinds of reasons.
Well he's the one who brought about changes. Changes are never popular with people and the person who brought about the changes is never popular either, especially when you are talking about such a drastic change from communism to western-style democracy that I am not sure if it's compatible with the Russian culture. And the first few years when Russia was reforming itself to embrace western-style democracy were hard, really hard on the Russian people especially so I can understand the negative sentiment that Russian people would have toward Gorbachev.