It doesn't make it inherently wrong, but I saw someone state earlier that a warblade was a full attack action and you could initiate a maneuver. I was just pointing it out. It does mean that you need to be careful about the recovery mechanic.
The first condition: it requires you to be hurt to use, and then it requires you to be hurt again in order for it to trigger. This means you want to be hurt. Which is counter intuitive. The second: is a swift action. That's nothing. It takes no sacrifice and has no real drawback. Warblade: swift+standard, meaning no full attack or maneuvers. SS: full round action (admittedly weak, and even with Adaptive Style (the full round recover all feat) it's kinda lacking). Crusader: maneuvers are not guaranteed. So the first one is one you don't want to use, because being hurt is a bad thing especially when below 50% HP, and the second one makes the first obsolete since you don't need it to basically auto-recover. Personally I think the Warblade one is a tad weak, and allowing a swift action followed by a full attack would be fine, just that it's a swift action that gets used up and you don't activate a maneuver.
Okay, and with Ranger Swift Hunters running around I don't see a huge problem simply folding the ranger and scout into the same class. The rage substitute is, IMO, pretty damned awesome when you get it. Yeah, you can't activate it whenever you want, but then again why would you be able to just fly into a rage for no reason? That's also why the bonuses, which you consider not that great, are so high? Should I increase the Adrenaline bonuses? You'd consider changing out features - so, which then? I am certainly considering lowering the Skirmish progression, that's the easiest thing to do.
I'm not so much against the combining of ranger+scout, I'm against the making them obsolete. By having the same mechanics only more and better. And I mean, I'd put a scout almost on par with a swordsage, the weakest of the ToB classes, and ranger not far behind, so power level doesn't need to rise much. This has the same number of maneuvers as the warblade, more stances, and the same number of schools to choose from, including one of the two most powerful. It does not have access to Diamond Mind or Iron Heart, so that's a plus (brings it down in power). I'd strongly consider slowing the skirmish progression and changing the adrenaline rush feature.
Adrenaline Rush: suffers from the same problem as Berserker Strength (the PHBII barbarian variant that activates when under a certain HP threshold). You must be hurt...a lot...to use it. This is not a good thing usually. Crusader did well with FC, since it's not a driving class feature and doesn't depend on a threshold, but rather just getting hit, and also HELPS survivability. Granted, the FH and AC boosts help survivability, but also eliminate the feature. I might be over-reacting a bit though, my minds not with me fully.
@Robby: yes, that's what I meant.