I don't know why you'd argue that MGR's combos are counterintuitive, because they really aren't. If you don't know how to do them, open the friggin menu, and voilà, there's the entire list of combos - much like in DMC4's divinity statue menu, as well as before starting a chapter. All of them must end in Zandatsu to be viable? That's just not true. Maybe you should use combos in a different order, at different times. Also, there's no shame in dodging or deflecting enemy attacks. If you get struck down constantly, you know you're doing something wrong.
I'm not sure you should consider MGR part of the Metal Gear series, actually. The only Metal Gear games still being made are the Metal Gear Solids. Since MGR is Metal Gear RISING, it's hard to consider it part of it all. Anyway, the plot is by no means terrible; I thought it was pretty interesting, really. I think it didn't even have plotholes.
It's not hard to see why people would think it's a kind of spiritual successor to DMC. It features a platinum-haired badass who even jokes occasionally, it's full of fast, fluid action and semi-combo-thingies, and it has an anime/manga-like vibe to it, which is NOT inherently a bad thing, whiners.
MGR is a good game. Most boss fights are usually a bit gimmicky, and the slow-mo gets boring really fast, but other than that, there's not really anything wrong with it. Platinum do corny games, alright? They do this on purpose. They basically created DMC1, too. Go figure.
A lot of people just want to whine about MGR because it's not to their liking, and they see the resemblance to DMC4. Fine. Go play wubwub games and leave this alone. Why can't it just be a good game? Opinions don't count as facts. Anyway, I'm done here.