Instead of people debating about my meaning, why don't I make it clear that I enjoyed the 2-D metroid games much more than the Prime series, and I only consider the Prime series to be a spin-off. It brought shame to the entire metroid series because it turned an awesome 2-D shooter into a boring 1st person shooter.
I already told you this back in the chat, Prime is definitely
not a spin-off, nor is it a sidequest, or anything of that sort. It's just a series of games that takes place in the Metroid series, between Metroid and Metroid II.
It's fine that you like the 2D scrollers better, but to not consider the Prime series a TRUE part of the Metroid series is just ignorant, in my opinion.
Metroid Prime 3... well, the "Wii-remote" virus kinda infected the people at Retro, and it felt an awful lot like a target-shooter sometimes. Also, the ever-present people/machines telling you what to do made it feel shorter. And the final boss was a totally anticlimatic mess.
I liked the controls of Metroid Prime 3. The Wii-remote definitely worked, in my opinion. The final boss is hair-pullingly difficult in the hypermode difficulty, which I'm sure some people criticizing the game have not tried.
I thought the game was a nice length. I felt it was like Metroid Prime 2 in that area, with the having to go to three distinct areas and fixing them.
A thing I probably would've liked better was if the weapon system was like its predecessors, and similar to the game's visor system. Though, this system did work nicely.