Bless weapon is a daily, so that combo only works once per day.
Once a day for the entire battle. Nothing to be sniffed at. Not to mention the handy use of Salves to recharge a daily. Again, I'm not complaining about the massive damage. I was just making sure i had the right end of the stick.
I think anyone will agree that very few characters can compete with a +2 to hit at-will attack (+1 from the charge, +1 from Bless Weapon) with an 18-20 crit chance with a high crit weapon (+1d12+1d6 on a crit) doing 1d12 +3d6 +6 (+1d6 when bloodied which he can provoke for two rounds with his Beserker Weapon) not to mention the +5 dmg for Vulnerability to Radiant Dmg (minimum +10 vs Undead if the are caught by Solar Enemy Encounter Power) all at level 4, even if it is once a day for the entire battle.
Say the optimum conditions are met: Crit on a charge against an undead creature that has been tagged by the Clerics Solar Enemy power, with Bless Weapon activated while Bloodied: 52 dmg + 1d12 +1d6 or in otherwords 54-68dmg
Enough to Kill a lvl 5 Wraith even though it's insubstantial or a lvl 4 Ghoul even though its a soldier of the same level as the barbarian. Heck, you don't even need Boots, that sucker's toast. The dead don't make opportunity attacks. Charge the next one!
Hey, what if he took the Lvl 1 Thunderhoove's Rage from Primal Power? He can now move through enemy squares. He can either charge past his fighter ally into flanking position moving in a straight line with no need for manuevering at all, passing through the enemy square for a total of +4 for the attack and add another +1d12 dmg to the attack! If the enemy takes th OA while marked by the fighter, bang he gets hit again!
Here's an interesting question, although I suspect the rule about moving to the nearest enemy square on a charge may cover this. Can the Barbarian charge from one side of the target to the other passing through the Targets square, hence moving 2 for the charge, in a straight line to what remains technically still the closest square ...? Neh, now I'm just getting silly.