Call your DI? What's up with people "calling" DIs or techs, if the guy DIs behind you, you do X, and if he DI's in front of you, you do Y, simple as that. If you're not reacting fast enough and you need to "call" DIs after throws, then you should pay more attention and/or try harder.
I don't think Holy calls the DI, I think he just attacks you, just like you can react to a spacies DI in melee to combo him with Marth after uthrow. Reaction > prediction, and reacting after a R.o.b. dthrow isn't as hard as techchasing a Melee Fox with Sheik on reaction.
Also, about R.O.B.s dthrow, if it works on a character, it will always work on that character, and even more at higher percentages, since there's more stun off the throw at high percentages, and the distance after the throw is not big enough to evade the throw. Also, like previously stated, most characters can't DI out of it.
Besides, it's not like Ness spams bthrow all stock, what's the point of Ness bthrowing at mid percentages? On top of that, he has a short grab range.
R.O.B. has more grab set ups then Ness and out camping Ness is easier than out camping R.O.B.
When you rush down Ness, it's less dangerous than rushing down R.O.B., more often than enough you'll get punished a lot harder if you're close to R.O.B. Ness having a kill throw can actually be motivated.
R.O.B. loses nothing from dthrowing to nair, except if the opponent is at low percentage or near the edge at low-mid percentages. After the initial combo, it's usually "back to dthrow" time. R.O.B. is a good character.
Also, how much damage does dthrow-nair do? Anyway, just make the move like a Falcon throw. At least give the opponent the chance DI the dthrow at higher percentages, and evade death.
Bad/No DI would result in linking the nair getting the kill/damage in, and DIing properly away will most likely put the opponent off stage anyway, so R.O.B. gets a free edge guard. At even higher percentages, Bad/No DI would get the opponent closer to the kill ceiling too, but DIing away would let you live, although you'd be farther from the edge, giving R.O.B. an easier edgeguard.
Would it still be ok like that? I'm just trying to find a good solution.
(also I hope you don't mind me referencing to melee all the time, I just assume you guys know what I'm talking about)