I forgot to mention something important... I'm off today.
Final Smashes are irregular moves that can't be accessed at will, and in competitive matches, are never used. Final Smashes in no way relate to how good a character is; Wolf's FS is possibly the best in the game, but he's middle tier. Meta is the best in the game, but his FS is only average. Sheik is low tier, but her FS is devastating (although yes, Zelda is high tier; but not top!).
Note that since Ike has a downside, he's not the best. >.>
And for sake of mention, Ike's FS is actually only slightly above average. The knockback isn't as good as other instant FS' like Zelda's or Captain Falcon's, and the damage isn't that good. It's saving grace is it's priority, range, and ability to pick off multiple foes.