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As it says, an A or B rating means that is a buy. Based on all the criteria Weiss uses to determine the rating.
The lower ratings for the rest of the coins could be due to the recent correction.
Weiss also notes that

Despite extreme price volatility, cryptocurrencies have a bright future and the potentional to deliver unusually large profits to investors.

Coin Marketplace

STEEM 0.16
TRX 0.13
JST 0.027
BTC 59248.66
ETH 2601.84
USDT 1.00
SBD 2.43