The Skyward Strike was definitely a fun element to implement into the game, however I personally believe it lacked a certain . . . smoothness, if you will. There were many times I found myself in battle wanting to use it, yet it took so long to charge up I usually ended up giving up on it. I find if it had of charged up quicker and done more damage, perhaps, it would've been more worth while.
I really like the story idea behind it much better than it's actual battle usage, however, because it really did give a lot to the story. The fact that you were sort of "using the power from the Goddess" really made the whole idea behind the sword make sense. I liked how most things sky/goddess related required a Skyward Strike, such as activating a Goddess Cube or striking the bird-crest thing usually found at the end of dungeons.
The best implement the move actually gave me, however, was it's usefulness for far-off foes. It made it very convenient to surprise a foe or knock one down (I know I personally used the Skyward Strike a lot in Faron Woods to knock Bockoblins off of tight rope). Also, it came in handy if I was out of deku seeds for the slingshot or arrows for the bow.
I'm really glad they brought this move into the game and I feel it should stay unique to Skyward Sword. It gave a great-story element along with a semi-useful battle technique. I ultimately would've changed it's usability by making it a bit easier to summon. I like how they brought it full circle at the end of the game, as well, when you finally . . . egh em awkward but don't know how to make one of those Spoiler cover up things so, yeah, I'll leave it at that. Those who have finished know what it ultimately does at the games end ^.^