They are useful in all instances. It just shows how the player was compared to his contemporaries. I don't think there needs to be a time stamp on that. They are most important in the 90s when 40-50 home runs were no longer something special, thus OPS+ can show you who truly stood out.
Made up stat? You do realize they use stuff that happens on the field to get the stat? It's not any more "made up" than batting average is...
I understand your point that HR, hits, etc. are easy to see, easy to point to and yes they are still used. You'll notice anytime I put a stat line in I'll always include HR/RBI, etc. I just tend to put more weight into value-relative statistics as they help you better assess someone over the scope of their career or the scope of a year.
I understand what OPS+ is. You are missing the point i'm trying to make.
I don't need to see the OPS+ numbers to tell you Dawson was better than Gary Maddux or Eddie Milner or Milt Thompson because I saw those guys play against each other, and the numbers they put up have context to me because that era unfolded before my eyes.
Where OPS+ is particularly useful, is looking at guys from the deadball era or the 1800's or the 1950's or the Federal League or any other era you didnt witness and may not have any point of referance to.
I like the stat, but it's just a guide. You scan down the column of a particular player, and say to yourself, "Ok, Bubbles Hargrove was an above average player the majority of his career, that's what I wanted to know". It's not the be all, end all of a players worth, and i'll tell you why:
-OBP, while very important, doesnt tell the whole story. A guy who walks 50 times dosent carry the same value as a guy who hits 50 HR's. Stricly going off of OBP, they are equals.
-SLG does not offset the above. SLG is a highly suspect stat IMO. Would you rather have 200 singles, or 50 HR's? 100 singles, or 50 doubles? SLG calls it all equal. It's not.
I'm not knocking the importance of OBP, but i'm not a slave to it, either. A plyer can get on base at a .430 clip, as a slap hitter who can't run the bases. Another player can be a .330 guy, but hit lots of HR's, and have great baserunning instincts. Who would you rather have?
This is why you can't be a slave to OBP or OPS+ as a black/white "the 143 guy had a better year than the 124 guy". He probably did, but baseball dosent really work that way, no matter what the slide rule dorks at Baseball Prospectus tell you.
BUT HERE IS THE KICKER...
Andre Dawson had 16 consecutive years of 100+ OPS+, meaning he was better than the average hitter for almost TWO DECADES. 6 or 7 or 8 (subjective) of those years he was ELITE, particularly from about 1978 to 1983, when you could argue he was the most complete player in his league.
So even by the dork stat standard, he measures up very well against his peers...but then again, some people think those peers werent any good either (oh, I dont know, lets say Winfield, Rice, Sandberg, Perez, Carter...), so I dont know what to tell you.