Examples:

• Otherwise, there're just images, which is already not half bad.
• That was not half bad for your first time.
• That was not half bad for your first time.
• You're not half bad with magic.
• Turns out it's not half bad.
• Plus the show's not half bad, right?
• I'm telling you: Berlin, it's all go, not half bad.
• Oh, she's not half bad.
• He's not half bad.
• That's not half bad.