I wouldn't be bothered with a power gauge but it could diminish the realistic surprise element when playing against a human opponent.
For those struggling on direction, try holding the direction you want your shot to go for longer. It seems to work with class strikers (eg. Raul, RVN, Henry). I tired it a couple of hours ago while playing WE7 and it managed to pass my mate's keeper who was diving in the same direction. Nearly pin-point in the bottom left-hand corner.