they cannot fly, cannot see invisible things, cannot affect incorporeal/ethereal things, only the Swordsage has access to any form of teleportation, etc. etc.
they also tend to do less damage than an optimized Barbarian/Fighter/whatever
in short, they are not magic
I mean, the Crusader and Swordsage have some supernatural stuff
but they are nothing like a spellcasting class
the one caveat I will give you is that from my perspective, it's hard to "screw up" a Warblade, while it's very easy to screw up a Fighter or Wizard
if everyone in the group doesn't know what they're doing, the Warblade can be best just because he's a Warblade
and ultimately, they are better-designed classes than Fighter, Monk, Paladin
which makes them more versatile and flexible, capable of contributing more to more encounters
not getting sidelined as easily
but for pure damage, some kind of Ubercharger is what you want and Tome of Battle's not how you do it
and if a Warblade's pretty hard to screw up, a Druid couldn't be simpler to overshadow everything
1. Take Natural Spell. 2. There is no step two, you've already won.
do that, and you're 1.5 Fighters who also gets full spellcasting off the second or third best list in the game