Isn't great
Isn't great is when something lacks awesomeness.
Example
Person 1: "And then they set that wrong, which in a word, isn't great."
Person B: "Isn't that two words?"
Person 1: "I hyphenate."
Person B: "Well I'm reading it back now, and you didn't."
Person 1: "How are you reading us talking?"
Person B: "... through the forth wall?"