DDD has plenty of approach options. In the current set he has SH double Bair, SH Dair > double jump, SH AC Dair into his ground options, SH AC Fair, DC tilts or DC jab, running into shield, etc... Saying he has like no approach options is just a lack of knowledge. Look at vBrawl DDD, do you honestly see just spamming shield grabs? He's evolved well beyond that point and its almost sad that somebody could really say all he can do is run into his shield as an approach.
He can also force a lot of characters to approach him with waddles, and he has a large area around him he effectively zones in. Ftilt, Dtilt, Bair, Fair, and Dair all come together to make a big area where its dangerous to let DDD remain in control.
About why DDD needs nerfs, it isn't that DDD is broken. Its that certain moves are broken. Bair on its own single handedly counters a large portion of characters. It hits quickly on frame 6, has a long lasting hitbox, and its hugely disjointed. Most characters simply cannot do anything about it. Dair does 17% and combos into most aerials regardless of the %, and can even combo into Utilt if you DI wrong. 17% for a hugely disjointed move that not only provides DDD with amazing safety from above but combos regardless of % is too good.
Let me assure everyone that DDD as a character isn't changing much at all. His Dair is taking a damage nerf, but its still going to keep its combo abilities, and great defensive usage. Just less damage on such an all purpose move. Bair is going to match its animation in terms of hitbox size, and will be nerfed in damage and IASA will be moved to frame 36 from 33. That prevents DDD from a SH Double Bair. Essentially Bair keeps its speed, lingering hitbox, and will become a better WoP move with lower damage (and KB as a result allowing it to link into itself for longer). Dair will feel the same but with less damage (so other options may become better when needing to rack up damage quickly) and Bair's nerfs will have Fair become more prevalent.