I don't particularly like the comparisons. I know the intent is to compare how the three classes measure up while pursuing a particular goal, but I wouldn't expect the barbarian, for example, to be focusing on feats that are unusable when he rages. Instead, he could go farther down the power attack chain, and perhaps head for Combat Brute. Likewise, the use of a Combat Expertise based build for the fighter ensures that the fighter will have the same stat spread as the Warblade, negating one of the warblade's disadvantages. Were the fighter not required to pursue int 13+, he could instead raise his other stats, perhaps his constitution to a 16, or his strength to an 18.
On top of that, you gave the fighter a 14 dex and plate armor. He could shave that down to a 12 with no cost to his AC. Between dropping dex to 12 and int to 10, the fighter could attain an 18 strength if he so chose.
I don't think the fighter got a fair shake, or the barbarian for that matter. I concede the warblade is powerful, but... this comparison doesn't show much.
