I love sabermetrics. Use them all the time. They’re valuable and important.
WAR is well known to this point, and at times it can be seen as gospel. It’s not. In fact, because the statistic is reliant on several variables including other statistics that aren’t always precise, there can be quite a bit of noise in a final WAR calculation. Plus, multiple sources have their own versions of WAR. What Baseball Reference calculates (rWAR) isn’t what Fangraphs calculates (fWAR). Still, despite all this, it’s a great indicator. It’s generally accurate in comparing players, and especially groups of players.