I recently completed John Nunn's Best Games 1985-1993 (Batsford Chess Library, 1995), annotated by the author. GM Nunn is one of the chess world's most accomplished and interesting authors, and has been referenced multiple times on this blog. Some of his other works are specifically aimed at improving players; this is not one of them.
I would say it falls into a similar category as Victor Korchnoi's best games collection - these high-level annotated games are similarly high-quality, but have relatively little hand-holding for Class-level players. The benefit of studying annotated games collections from the author's own perspective is that you get a unique window into both their chess-related thought process and general psychological factors affecting the game. Nunn's thought process insights are uneven in their level of detail, but in many of the games he does provide more of an explanation of the positions' key characteristics and his evaluations, making them very pertinent for improving players. The biographical details are both personally interesting and lend useful context into his state of mind for each tournament and game, although the chess politics comments are now mostly irrelevant.
One theme that struck me while reviewing the games was Nunn's mastery of evaluation of compensation, which involves understanding positional factors that outweigh the material balance, in the absence of forcing tactics. His comments in that regard I found particularly useful, and are not something you can easily find in chess training material. Nunn's games were also routinely very tactical and combative, with a lot of King's Indian and Sicilian games, so there was plenty of material there as well for understanding tactical concepts, visualization and calculation.
I'll close this with an example of one of Nunn's games (number 34 in the collection) that I think very well illustrates his mastery of compensation for sacrificed material.
