Go and watch metroid's Ike lesson video on Windy City Smash's channel on youtube (I'd link it, but I'm at work). C'mon @
metroid1117
you gotta promote your work dude
It's from 3.02, but Ike didn't change much in 3.5 so the things he says in that video are still relevant, and metroid's understanding and insight into the character is always awesome.
QD tricks are useful, but don't become one of those guys who uses QD too much. If QD becomes your main movement option it will only work on people who are unfamiliar with the matchup. They'll catch on eventually, and then you've taught yourself to rely on something that you will get punished for often. No bueno.
As far as movement goes, Ike's actually not too shabby. His run speed isn't that great obviously, but his DD and wavedash are pretty decent, and his wavelands are sexy. Aerial momentum is a huge part of Ike as well. Run forward and jump and watch Ike soar through the skies like a blue haired bird of freedom. When you're flying around you threaten a lot of space with the possibility of Nair and other stuff (RAR Bair/tomahawk grabs). That being said though, Ike is very punishable if he wiffs. So never overcommit.
Ike kind of lends himself to a passive-aggressive play. You don't want to act most of the time unless you know you're going to be able to get in (nothing is really safe on shield/ lots of end lag on moves) but once you get in, you can generally stay in your opponent's face for a good long time. So play it safe, but always make people feel threatened by Ike's range.
Grab grab grab. Grab a lot. Whenever you see an opportunity to grab, do it. Ike gets a lot out of grabs. You'll never regret getting a grab. When I played with mudkyp (a pretty good Melee Peach in Chicago) he said I grabbed him with Ike more than he'd ever been grabbed with any character. I guess I'm a little grab happy, but it's so good. Learn to QD>JC grab. Learn jab/jab-jab>grab mixups. And learn the follow-ups off of throws like metroid said.
And don't forget. Always fight for your friends.