J,J is not the 4th ranked hand preflop hand.
QQ is considered 4th by most pro's
A,K suited are considered the 3 most powerful preflop hands.
J,J is considered 5th or 6th behind Q,Q and most pros say A,Q suited.
Pocket pairs are realy easy to play. If a over card comes you just need to be willing to throw them away if strength is shown.
Jacks are a farely strong preflop hand. But keep in mind the strength of your haqnd changes every time a card is turned over. If the flop comes Trash, you hand hasn't improved but the strength of it has because the odds
of a over card coming is less likely. If a over card comes on the flop than your hand strength is weaker. The more over cards to come the weaker your hand becomes.