Or as Amanda tells me the british would say, with various inflections to suit the exact situation, “Not bad”

So, ‘Come to our “Life is Not Bad” Party at which time we can continue the debate as to whether we are having a good time, a not bad time, etc.
(Clearly, with your latest argument, you are a notable debater, whereas I am just BSing my way through this) See you at the Not Bad Party!
G  =:~)