Of course, as has already been stated, my actions are going to be dependent on how the table is playing as well as my table image. I often say that I always like to raise or that I never limp in. This might be an exception to the rule. I wouldn't want to invest too much into pocket 4s, as I am likely to be looking at a board full of over cards after the flop. I would like to limp in and see a cheap flop and go set mining. However we have to weigh the chances of action going around the board with no one raising. If we're just going to fold to any raise, then this should probably be an easy fold without wasting a BB.
Consider this, though. It is universally accepted that the earlier your position, the stronger the starting hand you need to play. So why not take advantage of that? If we put a raise in from UTG, we are likely to be given credit for a stronger holding than we actually possess. If you have a tight table image, you might be able to take down the blinds here with an under the gun raise, or be able to see a flop heads up, where a continuation bet could win the hand for you if your opponent misses the flop (remember, you're going to have position after the flop). In fact, I've played small pairs in similar fashion and had hands like pocket 4s hold up to the river against a single opponent.
I don't know. The bottom line is that my goal is to take down pots, stack chips, and win. So after all the thinking and reasoning, I end up right back where I started, where I pretty much always stand on playing a hand, either raise or fold. If I'm going to play it, then I'm going to play to win with it. But I don't think it's an auto fold.