Another one of my favourite chess books. And yes, of course, it's fucking old, the opening theory is frankly ridiculous, and Stockfish doesn't think very highly of Tartakower's analyses of 75 years ago... but this guy had just such a wonderful style of writing, witty and humorous and sarcastic -- it's one of the very few chess books that actually is nice to READ.
Those oldschool games may not be the close-to-perfect chess of today's Supatop-GM level games, but to me this is actually a plus. Those guys made very human mistakes, and I think this helps me learn much better because those are the mistakes I would do too.
It also really like its arrangement according to openings. Despite its age, this does help giving you some ideas of how middlegames usually turn out in the various openings. The main drawback stemming from its age is that some openings just are barely represented, or not at all. I'm hoping for someone to do a similar book with post-WW2 games, although I doubt anybody could ever match Tartakower's brilliant prose.
So I'd say this is a wonderful book for any true amateur (= lover) of this fascinating game.