This review doesn't make sense to me. How far are you into the game? What do you mean by "lead by the nose". I haven't played in roughly a year or so but I remember stopping shortly after beating the boss of the floating city and it definitely didn't feel like my hand was being held. Also there is auto targeting. I think there was 3 different aiming options. Manual for advanced players, full on auto aiming, and auto aiming that locks onto target, but can still move the target redicule for precise shots. You might want to check on your settings.
I think I have the third aiming setting where I can lock on but if I so much as twitch my Wii remote I loose the target.
By lead by the nose, I found that (for a Metroid) the game was a tad bit more linear than I expected (and I'm pretty sure I'm past the floating city planet); I hated Metroid Fusion for this. I think for Prime 3 it has to do with how all of the worlds are split apart, whereas previous Metroids were interconnected. It just feels like each Prime after the next got worse, and 3 is the worst of the bunch. Still a good game, but not great and not stellar.
If you think for some reason that a 3/5 is a low score, I wouldn't necessarily put that grading on a percentile scale (which is why "Good" is next to that score). I'm using Backloggery's rating system: 5 stars is outstanding, 4 is great, 3 is good, 2 is decent, 1 is bad. Prime 3, from the amount I've played (at Pirate world), is between good and great, but mostly good and I round down. It just doesn't live up to some very high expectations I have for Metroids.