Pot meet kettle as it pertains to cherry picking.
I provided a snapshot of 4 consecutive seasons where Tanana was a dominant pitcher - strictly as an example. He was one of the top pitchers in the league at that time. Please point me to a similar stretch in Darvish's career...I'll wait. I could do the same with Charlie Hough, because regardless of his win percentage (and I agree that can be misleading) he was one of the top pitchers in the league on bad teams.
You dismissed Hough & Tanana because their career ERAs were "barely over league average". That was your statement. Well congrats, you just described Yu Darvish. His career ERA is almost identical to theirs.
I enjoyed watching Yu with the Rangers, he was a good pitcher and was the ace of a otherwise pretty mediocre rotation. But let's be honest, he had one arguably 'great' season, that being his first when he won 16 games. That's the high water mark for this career. He's never come close to that since. The only season you could possibly point to was the jacked up covid season, where everyone's stats were weird.
My point is that every pitcher I mentioned had several truly great seasons in their careers. Every one of them, including Hough. Darvish has had one - maybe, that's debatable. And if we want to base the conversation on "best seasons by a pitcher in Ranger's history" there's a lot of better performances there as well....Kevin Brown's 21 win season, Jenkins winning 25, Matlack's season with a 2.27 ERA, Nolan's 301 strikeout season....hell, even Rick Helling won 20 games one season.
I'm clearly not going to change your mind on this, and that's fine....you're not changing mine either. I'm not bashing Darvish, and I'm certainly not a fan boy of any of the pitchers I mentioned. Look at baseball reference, and peruse their career stats. Look at several of the great seasons they had in their careers. Then try to find the same things in Darvish's stats. You won't, because it isn't there.
Jimbo Franchione