I haven't used CMC for a long time because I prefer to immediately see the price situation in the market because in my opinion CMC is late in updating prices and sometimes not the same as market situation
Not all coins are listed on CMC and even old and existing coins aren't shown up. CMC price doesn't matter cause we actually wanting to know the exactly in any exchanges as there is an actual trades happening. Any price fluctuations happen doesn't appear directly and tales a while before it become updated. So no worries about CMC.