If I want to use them in game, I do, but just use PP Ups.
As for competitive, you're lacking much needed power if you don't use them. Moves like Scald and Flamethrower are good, but if you're using something offensive, then you need to be using Hydro Pump and Fire Blast. But Ice Beam is pretty good either way, because it covers so much. --- Aut viam inveniam, aut faciam.