Sure, WHIP is a good stat to look at when you are trying to find a good pitcher for your team, but you shouldn't only rely on it. One of the problems with WHIP is that it doesn't factor in how a baserunner reached a base. The pitcher sees all baserunners as equal, so a walk is the same as a home run or a double for the pitcher. As such, don't just look at the WHIP but mix it with all the other pitchers' stats like ERA, shutouts, etc.