Nobody has claimed WAR is perfect. We realize there are flaws. Some of these flaws diminish its value, but that is different than saying it is meaningless or near meaningless.
To me, I just about never watch any MLB game not involving the Sox. There's no way I can tell who is better than someone else or better or worse than someone on the Sox. I use OPS, OBP, UZR/150, DRS, WAR and other numbers to try and place value or ranking by value on players. WAR is one tool I use. It's not the be-all-end-all, but I respect it while knowing its limitations and flaws. BA, OPS, Fldg%, RF/9 and all the other traditional value setter have flaws, too, and trying to determine which one is worth more than the others and by how much is something personal bias commands.
WAR has tried to scientifically place value on everything players do based on tons of data.
I look at it this way, when I know I don't know jack or close to jack about 29 out of every 30 players in MLB, and I'm trying to determine if JBJ or anyone else is better than someone else, I'm not using my personal observations as the number one tool. WAR is a good tool, but it is not all I use, either.
My observations of other team's players involves watching 162 games of whoever the Sox are playing. That's 1/32 of all games. I never see some teams play for 2 years. I see some for 3 games. Using data and other people's opinions (like the fielding bible) is the only way I can know.