Vietnamese taste buds here. I'm very wary of Vietnamese food outside of California as it's typically hit or miss, yet Doan's passes my test.
Doan's isn't your typical hole in the wall Vietnamese restaurant. It's very new, clean, and spacious (may be because they've only be open a short time. Only time will tell). Service is fast and attentive, though I should note I've only eaten here when it's sparse.
As per all Asian restaurants, the menu is a novel in itself. Pho and shaking beef have been consistently good. The pork and eggroll dishes were a (3/5), something I'd skip over next time.
Doan's will be my go to Vietnamese joint in Charlotte. It provides the same quality as Vietnam Grille (just down the street) in a cleaner environment with better prices.