Can someone ELI5 the controversy around CoinFlex liquidity?

I'm hearing basically two things about CoinFlex. 1) it's a great exchange with tight spreads and tons of liquidity. 2) it sucks, the numbers are cooked and they should not count towards BCH liquidity stats on coin aggregator sites.

Being that I'm not much of a trader, I'm not too familiar with the issues involved and I'm not sure how to evaluate the claims each way. Maybe side 1 is shilling. Maybe side 2 is just anti-BCH FUD that we know is par for the course.

Can anyone give me a run down of why there are such strong opinions floating around about it?