Etherlords is a game that I remember as having a unique style and atmosphere, partly thanks to the music. When I was buying the game, I was also looking forward to updating my soundtrack (I had the old 128kbps version which was supplied with the Russian edition of the game). That's why, probably, I was so disappointed.
I have 25 files in my old OST - 22 are supplied on CD2 of Russian 2-disk edition, and 3 more I've copied from the game's "resources" folder - Credits, Interface and Loading (the latter being an edited version of Synthets Battle 02 track). The GOG's OST has 18. It's missing Kinets adventure, Synthets adventure, Synthets battle 1 and 2 (all present in the game itself), three bonus tracks from Russian edition and the " Credits", "Interface" and "Loading" tracks. There are, however, three tracks called "ad_Green02", "Ending" and "interface02" which are probably from the sequel (at least two of them are in it's OST archive).
The ID3 tags look like the tracks were downloaded from different locations and just thrown together. At least the bitrate is uniform - it's 192 as opposed to my 128 (the fun fact is the tracks from the sequel are 192 too, despite being 128 in the OST of Etherlords 2).

I understand GOG is not a music service, but come on! Just a tiny bit more consistency won't hurt. Maybe it's illegal to complete the OST using game's resources, but it takes just a dozen clicks and about 15 seconds to correct the tags!