Look all stats have their limitations. If a player has a .329 batting average, that probably means he's pretty good. But for an accurate measure of the player, we need more information. How many extra-base hits does he have? How many times does he walk? How many stolen bases? How many runs, how many RBIs? How many double plays has he hit into? The same is true for a player with 40 home runs. Does he have a .300 average to go with them, or a .230 average? Does he strike out a lot? How often does he walk?
The same approach should apply to WAR. We need to look at many stats to assess players, and one of them should be WAR. But it shouldn't be the only stat we look at or cite.