1. 3.75/5
2.
-banana > usmash
-dtilt > usmash
-utilt > usmash
-dash attack> usmash
-dash attack > utilt > usmash
-usmash> usmash
3. This move is really MU dependent for me. In a couple of MUs it's amazing and then in others it's just average. This move is great for punishing spotdodges overall or if you're like right on top of each other. It's 1 frame faster than utilt as well. Any character that likes to approach with airdodges it's typically good, for example Wario. It's really good against Luigi as well since it beats out moves like dair and nair.
4. Since it's good for spotdodge and up close battles in those situations it's usually best to jump cancel it OoS for the additional speed.
You can bdacus, for those of you that don't know what it is it's a buffered dacus. It's done by buffering a dash attack then cancelling the dash attack into a Usmash immediately. It has it's uses, but it's hard to learn, I've been working on it out of an air dodge to start off a match on platformed stages.
It lifts you off the ground and can avoid a lot of grabs tilts and smashes.
edit: also, this can be DIed out of as well as fsmash, but it's a bit harder.