Yep pretty much this, I don't really get the whole issue with the game to be honest, I love it, my friends love it, the only complaint any of us had was the length but when we thought about other 2D Metroids their pacing was a lot faster and you could beat them within a few hours if you knew what you were doing.
People just seem really upset that they wanted retro's depiction of Samus rather than the original creators, which is normal since most of the western fans were brought in with Metroid Prime.
The biggest complaint is that people wanted a successor to Super Metroid and what they got is a game that doesn't have much in common with Metroid as a whole. Under these circumstances it would have been better to make Other M a new IP, instead of making it part of the Metroid series.
The same holds true for Phantom Hourglass and Spirit Tracks which shouldn't have been called Zelda games and it would have benefitted everyone. Nintendo would have had some new IPs, fans of the existing franchises wouldn't have been upset that their favorites got morphed into something they shouldn't be and those who really liked those games would have liked them regardless.