http://www.youtube.com/watch?v=q4Rbs3DX3AA
You attack at nothing a lot and don't really think about where your opponent's next move will be. aka Auto piloting.
For example, 1:45. You hit him with a glide attack and then naired and faired at nothing. You need to watch your opponent and pay attention to how he DIs and follow up according to what he does by habit. Everyone has a set way to do everything. Pay attention to that and punish them for it.
Another thing, your spacing is poor and you just run in guns blazing.
2:03 what is that bair, then through out those few seconds you just try to attack wherever Ike is without thinking.
Also, pick better options.
1:22 That was just not smart. If you see an Ike charging fsmash, that is the last thing you want to do.
2:15 Why did you up throw? Dthrow or grab release are better because that would put him in a bad position. If you up throw you're helping him recover.
tl;dr play smarter, work on execution and pay more attention to your opponent.