As a G&W main in melee, I'll post my opinions on throws. Brawl dthrow is good in it's own sense for sure. provided you aren't against luigi or somethign with a big tech roll.
Melee throws
Uthrow: Vs spacies bread and butter. Chaingrabs till 40ish, perfect for comboing up till 75ish?
Dthrow: Vs everyone bread and butter. Leads into nair vs... everyone who isn't a fast faller at low-med %s. FFers at high% along with most non floaties (70-90ish for most of the cast) Chaingrabs sheik 0-35ish spacies: 40-100?
Fthrow/Bthrow: Chaingrabs spacies if they DI towards you (DI Trap) and great against spacies if they're near the edge (Identical in usage i believe)
Decide how you see fit since G&W:M and melee G&W are WAYYYYY different as I can tell. (L-canceling bair + better sheild + better recovery makes G&W a good char alone imo, but i'll see as i play
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