We should be happy that Retro is making a good game; as Sponge said, Donkey Kong Country fans are finally being given some real Country-style games after the Gamecube drought (And I was a fan of Jungle Beat; it's a good game, it's just not a good Donkey Kong Country game).
I want a Metroid game, but we ain't getting one, and there's not much we can do to change that.
It's not that confusing. Window dressing aside, DKCR had more sound mechanics and environmental interaction for a traditional Metroid experience than the Prime games. Shift the tone from cartoon jungle to creepy other-world and design levels around a connected map instead a linear stage by stage progression and you'd have 10 times the Metroid game that Echoes or Corruption were, possibly even Prime.
Hey, remember how smooth the mechanics were in Metroid? Metroid 2? Even Super Metroid had damn clunky mechanics for the grapple beam. Being a smooth 2D game does not a Metroid title make.
What makes a game Metroid is the element you glaze over so quickly, the "connected map". That little element is what made the original game unique and famous, and it's what made Super Metroid exciting too. It's what separates Metroid from Donkey Kong (Except for Donkey Kong 64, but that sucked) and Mario and whatever else. It's that sense of being in an alien world and being a space explorer and feeling powerful but also curious. Retro might not have been able to transition the "screws through enemies without thinking" Samus of the 2D games, but they still made the first-person controls feel powerful and dangerous; just like in the 2D games, you never feel like Samus is a weakling.
But I guess what makes a Metroid game Metroid is being more like Super Metroid in mechanics and looks and feel, because fans can't get their heads out of their asses about Super Metroid. Fuck Super Metroid, it's a Godly game, but I'm sick to death of it being held up as the be-all, end-all of Metroid. Yeah, Super Metroid had more agile controls for Samus; Prime had puzzles (Aka environmental interaction), better atmosphere, and more varied room design. Both games are really good. Hell, Zero Mission is also really good; it's far smoother than Super Metroid and is better for speed runs. Metroid Prime 2 might have some significant problems in pacing, but the boss fights are nothing short of genius. Metroid Prime 3 had an awful cinematic story, but its world design was the most creative and interesting of any Metroid game. Fusion is a chore on repeat playthroughs, but it does have some pretty good creepy atmosphere and a really good boss in Nightmare. Metroid 2 has the OG Spider Ball, the most fun upgrade in Metroid.
Yeah, Super Metroid is the best or 2nd best Metroid game, but it's not all that can ever be done with the series.