Ideally, the UA articles aren't just a bunch of new subclasses. After all, the Ranger is getting a new overhaul top to bottom.
Aside from that, I don't think the quantity of Subclasses is what you should be measuring, but rather the quality of them.
Barbarians need options that aren't Totem. And technically the Totem has like 5 mix and match sub-subclasses anyway.
I think the Cleric needs a ton of work, seeing as how nobody seems to like them, and some people are having trouble imagining their purpose of being.