I went through 6 years of Brawl where this very same discussion happened. No European/Japanese or me could figure decent options with bombs. I'm hoping enough has changed in smash 4 (Rohins #1 seems like it will work good) for this move to be useful again.
If any of you can find reliable uses for it, share it and let's get it on.
This is my first real dive into this series so please take anything I may post here with a grain of salt, but in an effort to keep the conversation going I would like to contribute a couple things I've found since I've been trying to make bombs a useful part of my toolkit.
Some things I've tried and I consistently fail at, which may be useful in the hands of someone more skilled than I am:
Short hop forward, bomb and retreat to stop rush-ins. They may trade a 9% bomb hit for a rush attack which puts Samus in the air and them at a faster recovery. This might work better if I maintained forward momentum and forced them to attack behind me, could probably sneak in a down tilt or throw.
*edit* I wish bomb jump recovered just fast enough for a bair, I have a feeling that would be really fun.
I don't think it's possible to drop a bomb in the height of a single jump that allows you to uair into them, locking them into the bomb hit if they shield (or don't) and allowing you to combo into the move of your choice.
Some things I've tried that seem helpful, but that perception may be due to my current skill level:
Ledge-guarding with bombs seems effective. If someone is obviously looking for a ledge-grab I'll often jump out and drop a couple bombs and then prep a charge shot when grounded. (if prepped then I just watch for their recovery to react.) I've stuffed a good number of up b recoveries and interrupted some horizontal b recoveries with this as well.
Recovering with bombs seems better than advertised, but probably needs a better mix of bombs and airdodging than I currently mix into my game. Besides having some offense while recovering the morph ball floaty movement seems to give a lot of horizontal recovery. Most memorably a Falco was chasing after me near the top of the screen, I dropped a bomb, dodged his attack, nailed him with uair into the bomb into my up b which killed at that height.
Finally, one tech I did accidentally I found terrific but I'm not sure how easy it would be to reproduce:
I was near the edge against an aggressive Doc Mario. He started to rush in so I dropped a bomb and rolled backwards a little. He grabbed me out of the ball, the bomb detonated right behind him pushing both of us off of the ledge. In my attempt to recover I immediately planked him, securing an astonishingly easy KO. I think I saved that reply, so I may be able to prove this occurred.