When ever your involved in a hand you should really be playing against as few people as possible.
On a tight table - not too many people betting each hand - you can place a bet knowing that the whole table will come calling and it should be easier to win a pot.
On a loose table - lots of action and people betting down to the river - you should really try to raise early with big enough hands (AA, KK etc) to insure that the majority of the table fold before the pot prices them in.
If someone keeps raising - re-raising pre-flop only come up against them when you do have a decent hand.
Remember - they cant be getting good hands all the time but dont call just because its annoying you as thats when the poker gods will decide 'probably' to give him AA
Good Luck