I think I share you frustration; I understand it but I don't accept all of it (but I do accept most of it).
I like most of the stats on fangraphs but not WAR or FIP. Anyone who says that they don't accept stats such as WAR will be insulted on this forum, however, they are in good company since the best known Sabermetrics person, Bill James, who developed many of the stats and has written books on the subject, is NOT impressed by the WAR stat; here is what he says - http://mlb.nbcsports.com/2014/10/29/bill-james-not-a-statistical-guru-not-impressed-by-war/
The purpose of Sabermetrics is to try to compare baseball players from different teams, different time periods and different positions all on the same level. This is what Bill James tried to do with Sabermetrics; unfortunately some current Sabermetrics enthusiasts are taking it to previously unimagined extremes.
What I personally would like to see in the field of Sabermetrics is to simplify the calculations. People who have mathematical, statistical and baseball knowledge can figure out calculations that are just as informative but which can be calculated by anyone; it is just a matter of the right people getting involved. In fact the right people will likely be able to come up with simpler calculations that are better.
The WAR stat is not scripture. If people really want to know how much a certain player contributes to a team winning then there are better methods such as examining team wins directly (the W in WAR) instead of using a convoluted equation. One method is factorial analysis that can separate out the effect of one player among 9 players on the field.