The RE4 remake isn't the measuring stick to judge HD remakes by, but they can't change the controls. Most of the sales are nostalgia and if you mess with the game too much you aren't even selling that.
It's one of the best games ever made and tons of people still play. I can't imagine playing singleplayer and getting very deep, I wouldn't recommend it. Don't stick your toe in, just dive, play on battlenet.