Sonics have no accuracy penalty. I've never heard this story of them having one before, but it sounds like an old wives tale. My /Son defender hits just fine.
Sonic is a superb single-target set - the stacking -Res and mostly fast animations make it dish out damage fast - just as well as Ice, subjectively. I also love the ripple attack of the second single-target attack, I'm a sucker for "lots of numbers" powers. 
I respecced out of Shockwave because I didn't really need it, but now I'm thinking of respeccing out of Howl and getting Shockwave instead because it's underwhelming on the damage side, and I prefer to not have to worry too much about mass aggro. Single target for the win, and a ghetto control power (Shockwave) over mediocre AoE. I think the main justification for Howl post-teens is the AoE -Res to help the team out, but I think that's marginal really.
Sirens' Song is great. The sleep on it has proper controller-type duration and seems to last forever if they're left undisturbed. Makes soloing cake and significantly adds to the safety of teams. It's so good that I'm tempted to roll a Son/En right now just for the "Sleeping Blapper" playstyle.
Unthing is entirely correct.
Go to www.nofuture.org.uk/coh for accurate power listings.
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...and some of the cone is supposed to be indeed but I yet have to see it happen:P
Hasn't all other sets got a 5% increase in accuracy though? But Sonic hasn't. I'm sure I heard somewhere that Sonic has less accuracy then other sets.
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not 100% sure but I think the same rule applies for blasters as for scrappers. Draw your weapon=more acc..so is snipe..so that would give archery and AR more accuary