I agree that it's really nice for local co-op, but Nintendo's also failed itself lately with it. I'm still annoyed that Woolly World is both 2-player max AND it needs an amiibo for multiplayer (though I was going to get the $60 bundle anyway). Mario Party was a flop, and I was REALLY looking forward to it (if it were $30, rather than $35 at Best Buy this week, I might roll the dice). Splatoon murdered the local gameplay Then there's just the dearth of titles as a whole. I was hoping we'd get Mario Golf with Mario Tennis, and I prefer the former.
The upside is that Pokken Tournament is coming, and it looks sick, and Woolly World and Tennis should be a nice-enough pairing for the end of this season.
See, you're basically making up standards of quality, which just aren't the same. Forza might be best with a specific setup, but it was built for a controller. That's where the franchise started, and the game works just fine with a controller to this day. The input on those controllers has been tweaked, but not really changed. Those are the controllers built as the primary console input. If Forza Motorsport 7 comes out and requires a wheel to play, you'll have a point. Until then, asymmetrical analogies don't fly.
On the flip side, Nintendo started with the WiiMotion, then built games that didn't work well with it, then sold everyone Pro controllers to "fox" the issue for $50 each. The music games are different because they're not in-house creations, plus they're a genre that really can't handle a controller well. I don't fault them any more than I fault Just Dance for not playing well without Kinect. The last part is obvious--there is plenty of software to support entertainment on a basic level on the One. The Wii U is hurting for quality titles, by comparison, so when they launch their first new IP in, like, 10 years, it's pretty crappy when it requires a new controller (well, it works with the tablet, but for local multiplayer that's really lame, you'd need another $50 controller). Oh, and remember that at one point, Guitar Hero DID work with a standard controller.
Your gaming preferences really don't matter here, I wouldn't say. I'll play Halo solo, but mostly for the Solo Legendary Achievement. I play co-op with people online. Why "I don't need splitscreen" got turned to "I play alone," I'm not sure. I wouldn't play Borderlands solo, but after playing through most of 2 and a couple of hours of The Pre-Sequel (after liking the first a lot), I can also say I wouldn't play a Borderlands game ever again.
That you have a standard that eliminates Fallout, I find bizarre. Personally, I do like the solo challenge. Just as you say you don't liek being the solo killer of an army (which doesn't even happen with the A.I. team in Halo 5 in the first place), I don't love playing with infinite lives and much less challenge in co-op, where someone can serve as a spawn point in cover and it's incredibly easy to steamroll just about everything with two people (as if TWO people defeating a whole army is the magic line to realism).