I like it and it's what is expect from a open world game. Worst con so far is dying in the middle of a base raid might plunk you halfway through but all the enemies will be back, and sometimes it approaches good and sometimes they're way back.
Pro's would be the wide variety of handles mixed in, characters, quality and quantity of content. I like the way skills unlock, I keep wanting to pay more.
I haven't played every open world game though so maybe I'm just not burned out on them yet. Also I enjoy the multiple approaches to most missions.