I hate to say that any stat is meaningless, but IMO, a pitcher's W-L record is up there on the list of stats that don't tell you very much. There are so many better stats that can be used to evaluate a pitcher's performance these days.
That said, looking at the number of Wins a pitcher has does have some value. If you show me a 20-win pitcher, though few and far between, I'd feel pretty comfortable in saying that he's a pretty good starter, without looking at any other stats.
For instance, the two 18-win pitchers last year were Chris Sale and Tarik Skubal.