I've seen some reviews ranting about how this show isn't faithful to the original and too much has changed in the reboot. I however strongly disagree. The reboot is very faithful to the original, without repeating the exact same formula as the original had. All of the characters, including the triplets and Webby, now have their own personality.
Webby is no longer the stereotypical "girly" fourth triplet. She's spontaneous, creative and a quick thinker as well as a quick talker (even more so in stressful situations).
Huey seems to be the only one who's still in the Junior Woodchucks. He's the oldest, more organized triplet. He's not as spontaneous as his siblings are. But make no mistake: he's still mischievous. He seems to be cool with getting dragged into dangerous situations together with his two younger brothers, never showing any signs of being really scared. He's level headed. But can get overly excited about small things such as activities on field trips.
Dewey is the middle child. He's extremely spontaneous even more so than Webby and his two brothers. He's not afraid of putting his own life in danger. He seems to enjoy taking risks that put him in deadly situations.
Louie is the youngest triplet. He's by far the most laid back triplet. He likes to slack off. A lot. He is, however, ready to act whenever the need arises. He has talked to Webby more his brothers thus far.
Scrooge McDuck is believed to be the uncle of Donald Duck but the triplets have always called him uncle Scrooge. He's the richest duck in the world. He has a bit of an Indiana Jones vibe about him. He is famous in the world as an adventurer and loves to get himself into trouble (unlike the Scrooge in the old series). Despite his old age he's surprisingly agile and can take quite the beating and still fight back without any problem.
Donald Duck is the Uncle and the caretaker of the triplets. Unlike the original show, Donald will have an important role in the reboot. He was Scrooge's sidekick once but they parted ways after an incident of some kind.
I like the new voice actors surprisingly much. Some say the triplets sound a bit too old but I think it works. The writing is simply brilliant! Witty, mysterious and adventurous!
Seriously give the show a chance even if you never watched the original series. It's a reboot done right.