In general when speaking to medical students and residents I try, and encourage everyone, to avoid judging specialties based on the people. People change, locations change, the medicine doesn't.Also, Academic Medicine is not the same as private practice. There are tradeoffs for everything and many people find fulfillment in Surg and OB/Gyn despite the personalities.
It's not just that Urgent Care presents a very narrow scope of pathology, it's that it doesn't offer much of what many people claim they want from a medical career. It's not particularly lucrative in the grand scheme of physician compensation, there are few diagnostic dilemmas or other interesting pathology, scant procedures, rare longitudinal relationships (and may would argue that if there is a longstanding relationship, something is very wrong), it's not prestigious, you can't create a research career out of it. Further, it's prone to things that many physicians worry about including corporate ownership, over protocolization/cookbook medicine, significant mid-level creep, over emphasis on Press Ganey and other "satisfaction" metrics. Now I'll readily admit that some people DON'T want any of these things, but I'm not sure I've ever met any of them.
So what's left to make it attractive? Set hours (although still evening and weekend heavy), no call, low administrative demands, billing presumably handled, quick triage of sick patients (although you still have to manage them while waiting for EMS), and....???
Again, if you go in with eyes open and are woke to what the reality of UC is, then by all means, go for it. But I don't think UC is going to become the new favorite of graduating residents anytime soon.