The Tome of Battle classes are far from anti-fluff:
The Crusader is a warrior that receives divine sparks of power during battle to deal out hurt. (This is reflected in their recovery mechanic.) Of particular note are Crusaders of Heironeous and Hextor, in constant involvement with their holy battle. (Note that there's no Cleric/Paladin rules attached to this, thank the gods. /pun)
Swordsages are world-traveling people that know the most about The Sublime Way. (The IG reference to using ToB stuff.) They collect random baubles and trinkets in hopes of accruing more knowledge with the blade. They also have a sense of drive and individual purpose; they strive for reason.
Then there are Warblades. They are traveling glory-hounds that want to be the best at what they do, fight using The Sublime Way. Some are more modest about their goals, most often elven Warblades, while others duel adventurers at the drop of a hat, dwarf and hobgoblin Warblades. In any respect, they also put their mind into battle, admitting that it is as important as strength or speed in battle. (Exactly what it sounds like. Bonuses for having high Intelligence.)
A Ranger won't be getting any use out of this book, there is no school for ranged weaponry. Although there is a remarkably well written homebrew:
The Falling Star Discipline. Also implies some great fluff that has been written for the school; a method that watches afar not being known to but the bookiest of scholars.
As far as skill progression goes, Swordsages get a good amount while Crusaders and Warblades have less to play with.
As far as fluff goes, the Tome of Battle can be integrated by just reflavoring things. It's a bit harder to do, but it can still work. In a magipunk game where the gods sit back and watch the fun? A Crusader is instead a Mageknight, someone infused with raw magic that gives them great power in battle.