in cash games i am raising if i'm playing (assuming i'm first to open the pot), regardless of what it is. however,

lately in the early/mid stages of MTTs i've been limp/calling small to mid pairs in early and mid position. i do this because allows me to see a cheaper flop. if you raise from EP/MP with scs or mid pair, often times you are reraised and are forced to dump your hand. if you limp/call you can get it cheaper because you'll usually only have to call the one raise from a LP player, which is the same cost as if you had raised and got a few callers.