No, actually. Charged bolt is a very powerful skill.
Now I haven't checked this out lately, but I know I used to play charged bolt sorcs for the novelty. People would go "CB? Hahahaha" and then I'd wipe out the room. But because the patch introduced synergies, CB became a main-line skill.
Let's do some maths:
At level 20, CB does 13 to 15 damage (avg 14). Pitiful.
The thing is, you shoot 22 such bolts. 22 * 14 = 308 damage. Eh... that's OK, but not all bolts will hit one monster. It could be an OK crowd control skill, right? Maybe, BUT...
20 in the Lightning synergy gives +120% damage:
240*2.2 = 677 damage. This is actually getting good.
Now for lightning mastery: 677 * 3.8 = about 2500 damage
See what I'm getting at? Now, imagine yourself with a few fast cast rings and amulets, spamming charged bolt in a room full of monsters - there's no cast delay like on Orb, Meteor, etc. It's pwnage.
And you can use it on bosses, too. Because the bolts are clumped depending on where you click (near sorc = wide dispersal, far away from sorc = tight dispersal up to that point), you can thus control how many hit any one target or group of targets. With bosses, you can just walk up to them, cast it just in front of them, and watch them take all 22 bolts. Act bosses are easier because they're so fat they absorb them all anyway.
It's not exactly a safe build since you often have to get close. You've got a fairly synergised Lightning at your disposal as well, though, remember (it does 1,500 damage average in a line).
And I know the prospect may not be appealing at first, but you can start a new char with the advice we've given, and be up to level 15 to 20 again within 2 to 4 hours. Just a thought... personally I enjoy starting new chars. Of course, if you're playing with friends, you can just stick to an entirely cold sorc, as you'll do lots of damage, and your friends can handle cold immunes. You'd probably want to grab an act 2 defiance merc once you hit at act 2 in normal (so he can tank, and so he can handle cold immunes a bit, and so your defence gets higher).