The core of Reddit has become rotten not from the_donald; the site admins are 100% at fault. Trying to make their site 100% advertiser friendly has subsequently killed all transparency in what votes do, how subreddits are ranked, and killed a lot of discourse that was not corporate palatable.
I still enjoy the smaller subreddits. Unfortunately anything political becomes brigaded, but things like /r/gamingsuggestions and local city subreddits still make the site worthwhile to me.