I actually like a few shows on CN (Steven universe is actually my favourite cartoon rn), they're actually trying to pull back from their low, Adventure time is regarded as pretty great, along with regular show actually, in fact, they got three shows nominated for Emmy's this year (AT, RS and SU). According to the general public, We Bare Bears is kinda similar to Regular Show, and people find it ok, same for Gumball, where there are some pretty funny episodes apparently.
They do however have some duds, the worst dud they've ever had, that's Teen Titans Go, the worst show to ever grace animation, along w/ modern Spongebob. Uncle Grandpa is atrocious, but their crossover episode with Steven Universe was pretty funny. I've never watched Clarence, but my best friend (18 btw) says its a pretty ok, though alot of people don't like it.
All in all Cartoon Network's worst period was CN Real, that was pretty bad, as well as when they had Problem Solvers and Secret Mountain Fort Awesome.
So in my personal opinion, its not in its worst period, in fact its put out some of its best shows in the last few years, so yeah.
PS: CN>Nick