First of all: I am a long time, loyal fan of Hunan Express. They're reasonably priced, VERY friendly and super fast. When I'm having one of my "I don't want to leave the house" days they are my go-to for decent food.
The only one problem I have is their pork dishes. Simply put, the pork is too lean and tough. I figure the folks at H.E. are probably victims of the US Government's war on fat just like the rest of us; to get good, buttery meat we have to go out of our way to find proper marbling. It would be unreasonable to expect a Mom & Pop delivery restaurant to make that effort, I realize. Still, I would recommend against the pork here.
TL;DR -- Stick to the beef, chicken, seafood and veggies and you're all good. Love these folks.