Oh san. I wasn't saying it was good, I just found it to be the best attack to hit with at the time. Eruption is relatively bad, as is quick draw. Just an example.
Oh, I didn't mean to make it sound like I said that you said eruption was good. I was really agreeing with you and trying to explain. My bad if I didn't make myself too clear. I DO admit that I'm starting to use QD way too much, but I've never been punished for it yet.
Next part is somewhat common knowledge.. but oh well
I think on battlefield, down throw is Ike's best move. Nair to up air on ledges is seriously good, especially with it being really easy to up air out of dodge and when they land on a platform. Up air makes all platforms instantly unsafe for most characters without a a ton of aerial movement (which is most of the cast)
If they try to avoid the platforms, it makes their *recovery* in a sense back to ground more predictable. Up air beats so many aerials in the fist place, so it puts Ike in a very good advantage to weigh the options that the opponent has and the way he's moving in the air what he's likely to do.
Ike has full movement of battlefield with (dare I say it) full hop+QD which can be used to position oneself in a favorable position quickly, so you can set yourself up for SH bair or platform drop bair or whatever relative to the position of the opponent. Against opponents whom Ike can win pretty solidly in the air when colliding, some of these moves gives him a great advantage. I think up air should definitely be spammed on battlefield :D
They can't run away very well. Ike can move as fast as TL in the air, and up air's lingering hitboxes are bound to get them. If not, during a chase, Ike will be in the advantage anyways. If they dodged (non fastfall) you can most likely get a jab or something in. if you just missed, you're probably too far for the opponent to punish you.
if they dodge relatively straight down/diagonal, I read that fastfall up air may work (or even if you miss, you might have a chance to be fast enough with jab). It's either jump, attack, run away(same thing as jump), or dodge. If after a dthrow or nair at lower-mid percents, Ike is too close to truly jump and have it be overall successful (ON BATTLEFIELD). If they try to attack, properly spaced, against most characters Ike should win. If it's one of the more "dangerous" characters, this should already be something to be prepared for with higher % of happening, even though in Ike's up air range it's still difficult. Dodging is what you want to happen. At really low percents, it's good risk/reward with upsmash against most characters, too.
The way battlefield is shaped just gives ike a lot of opportunities. In some cases, I might not mind even playing against a snake or marth here.
TL;dr: dthrow and nair to up air (spam)= really good on battlefield?? Not entirely sure how other people think about it, but after having this work against a lot of skilled players.. why not.