Thanks to EA Origin's Free Game-Time one week trial, Battlefield 4's SP Campaign is in the books after approx. 11 hours of it.
While the stories, characters + all of that stuff is very weak + paper-thin, as you'd expect w/ a BF's SP campaign...
....the campaign was actually pretty good - b/c of the actual gameplay. I'm actually surprised.
And here's why.
Namely, I thought BF3 SP's lacked the huge spawling open-spaces + awesome battles that happen in the MP w/ lots of vehicles, enemies + action happening on-screen. Well, DICE must've heard my complaints there - b/c BF4's SP, for the most part, is loaded w/ huge just that: huge open-spaces + awesome battles to ensue in most of the game levels.
Sure - the game's linear, there's scripted events, and a lot of those linear SP military-FPS trappings - but my one major complaint from BF3's SP is gone here in BF4's SP. The battles when in those open-spaces - they're just like how I like the MP found in the BF games: chaotic + a lot of combat going on.
Now, if they could actually get some good character, plot + story writers for the SP campaign - they'd be onto something.