The following are my observed reasons
1. Many dead projects still on cmc
2. Market cap is fake Cox many projects which have seized to trade adds up to the market cap
3. Cmc doesn't verify authenticity of projects before listing it
4. CMC now have ads of fake icos on their website thereby leading people to scammers
Funny enough so many NOOBS believe anything and everything dey see on cmc to be authentic
Let me stop here and anyone against it should bring a proof to counter it
Or offer more options
Coinmarketcap is only shows information. I think it is good thing. You can consider a coin as dead one! But remember it has a investor! People gets info about their investment via CMC. Don't underestimate it.