Seems to me that you want to either limp in, or raise big depending on the table and position. If the table is playing really tight, raising will usually get everybody out except players who actually have a hand. Then at least you know what you're up against--probably face cards or an overpair.
If the table is loose, getting to see the flop with minimum investment is key. Players are playing all kinds of cards at a loose table--a flop that looks like it shouldn't help anybody could have made 2 pair for someone.
And, as Drago said, position is a factor. It's unpleasant to call from an early position, and then have a raise happen. You've invested already; how much more are you willing to pay/lose to see the flop? That can be a slippery slope.
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