What’s not to like?
Definition 1 of 1
Pro Tip 1/3Rhetorical Question
Used rhetorically to imply that something has obvious appeal or no downsides. 
She's smart, funny, and kind - what's not to like?
Pro Tip 2/3Positive Reinforcement
Suggests all aspects are positive, typically when urging someone to agree or to win them over. 
It's a job with a high salary and lots of travel, what's not to like?
Pro Tip 3/3Sarcastic Tone
Sometimes used sarcastically to imply that despite positives, there are unspoken negatives. 
Free coffee in the office all day – what’s not to like? (when the coffee is terrible)