Its true that it depends what he wants it for but that 'cookie cutter' response comes from years of the forum seeing people waste money on toys only to be disappointed with the experience and sell them soon afterwards. Gas guns do need a certain amount of experience and maintenance to get the most out of them. For home use is fine but for gaming they're very limiting to the inexperienced.
@Johnelliott Look at WE, GHK, Tokyo Marui for various price levels of gas rifles.