Since my post got removed, I'll try again.
Since Skyward Sword has a lower reputation in the series than numerous other games and the original poster hasn't explained why he holds his opinion, I assume that the opinion he is expressing is not very genuine at all.
As to why, I feel like Skyward Sword is not an untoppable feat. First, older games like LOZ/ALTTP/OOT were seen as the pinnacle of their time and unmatchable yet that didn't stop the series from releasing more influential games. Second, Skyward Sword has plenty of flaws: some inaccuracies in controls, repetition, late-game padding, immutable overworld, lengthy intro, lack of exploration compared to past entries and an empty sky world.
Better?