Personally, I tend to look at hands as families and study when and how to play each family.

Monster Pocket Pairs:
AA KK

Strong Pocket Pairs:
QQ JJ

Marginal Pocket Pairs:
TT 99 88

Weak Pocket Pairs
77 66 55

Baby Pocket Pairs
44 33 22

2 Big suited:
AKs AQs (AJs KQs)

2 Big Unsuited:
AKo AQo (AJo KQo)

Tens or Better Suited:
ATs KJs KTs QJs QTs JTs

Tens or Better Unsuited:
ATo KJo KTo QJo QTo JTo

Marginal Suited Hands:
K9s Q9s Q8s J9s (J8s)

Tight Suited Connectors:
T9s 98s 87s 76s 65s 54s

Ax suited:
A9s A8s A7s A6s A5s A4s A3s A2s

Kx suited:
K8s K7s K6s K5s K4s K3s K2s

Qx suited:
Q7s Q6s Q5s Q4s Q3s Q2s

Ax unsuited:
A9o A8o A7o A6o A5o A4o A3o A2o

Kx unsuited:
K9o K8o K7o K6o K5o K4o K3o K2o

(Suited/Unsuited) (tight/semi/loose/weak/non connected) Rags:
Just about everything else