There are more authentic options, but I really like Wok Hei. My Chinese wife doesn't.
Other good options:
Culver Plaza:
• Meizhou Dongpo
• Tasty Garden
• Tasty Noodle House
Diamond Jamboree:
• Tim Ho Wan
Irvine Village Center:
• Kingchops
Orange Tree Square Shopping Center:
• Hometown Restaurant
• Running Chicken
• Tai Chi Cuisine
• Yu's Garden