I can't tell you anything about the job market, but otherwise...
I've visited there a couple of times. Great place. Decent night life if you're into the bars. Also... because several breweries are in the city, you can get incredible beer for awesome prices. I recommend taking a bike or a cab though 😉
Nice city, fairly spread out over a large area for how much there really is. College in town, so there's the college crowd and everything that comes along with and appeals to them. Fair amount of live music almost any night, stuff like that.
I don't know about the library system for sure, but just guessing from the general atmosphere and attitude there, I'd think it would be good. There are a ton of coffee shops, some hipster-oriented shops and whatnot and free wi-fi and library access seem like things that would be a priority.
Some good sushi places around, too. There are a lot of mediocre ones, but one great one somewhere north... I want to say in Greeley (a 'suburb' of FC)
There are some pretty good grocery stores around. Several run-of-the-mill stores, and there's also a Whole Foods if you're into that. Next to it is a giant beer store 🙂
While I don't think this is the case with much of Colorado, and there are still exceptions to this, but Fort Collins seems to be more on the liberal side of the political spectrum overall.
I can't think of anything else right now - hope it was of some use.