ARandomGod, thanks for posting, I appreciate the input. As Wesley once said to Inigo Montoya, " please know I hold you in the higest regard".
Ok, down to buisness. 3/4 bab and ranged touch attack does mean the Warlock will hit pretty much every time he or she uses her Eldritch Blast, under the right circumstances. This is not a Bad Thing(tm) in my opinion as the Warlock will be able to hit the super high AC monsters like dragons, with low touch ac, dealing a trickle of damage,(assuming they penetrate SR), while the rest of the party can get the bless and other buffs up to hit AC 30. This is the Warlocks strength.
Now pit that same Warlock against a Ghost Monk/Cleric/Sacred Fist with good dex, good wisdom, high Deflection bonuses, high bonus AC due to wisdom, and cleric Protection from good/evil, Shield of Faith etc and you will see the Warlock at his or her worst. Warlocks have no way of dealing with incoporeal creatures, useless in terms of Eldritch Blast, without a little help from their friends, turining them etherial, etc.
Warlocks against High Dex or high Deflection, dodge AC characters will miss quite a bit more often, which can often be vexxing to Warlock players used to have ridiculosly low ACs to go against.
As for the Bewitching Blast, this is a greater power, first accesible at 11 level. This means a Warlock selecting this Invocation is not selecting the Evards Black Tentacles power,(see my post above for this signifigance
). The Save DC for this Invocation is a Will save of 10+5( total invocation level) + cha modifier, those failing the save will be confused for one round, and only one round.
Now due to the Warlocks level his or her Eldritch Blast is overall considered a 5th level spell. I can understand on a surface level how a DM might consider an infinetely usable 5th level spell that is a range touch attack that deals 6d6 dmg per hit with a chance to confuse an enemy for one round, overbalancing.
Until you look closer. Tanks will do more damage on average, Spellcasters will have more powerful spells, that either do more HD damage or will be save or die effects, rogues have 6d6 sneak attack damage which under the right circumstances will really add up.
Even the "lowly" bard can out due the Warlock in terms of easily defusing an encounter. A 11th level bard can Facinate up to 4 creatures, setting a Will Save DC= equal to his perform check,(at 11th level at least a +14 from skill ranks alone). With this accomplished the bard can then one at a time give each monster a Suggestion for free, and of course the Bard can do this a minimum of 11 times per day, which for my opinion essentially translates into at will.
For my money an 11th level Bard can be more encounter breaking then an 11th level Warlock using Bewitching Blast.