I have no frame of reference but...
I think your DPS would be very solid. The number of instant casts you have, the ability to throw any curse you want on any target, and your pets would give you a fair amount of flexibility.
In PvP, the "drop Debuffs" spells will hurt you a bit more, but I think you could still overwhelm people or force them to pop that Cloak of Shadows faster than they'd like. And while a rogue can stunlock one warlock, having 4 more ready to fear him off sounds like sweet revenge for a solo lock player like myself.
If you have all 5 of your locks drop Co(1-5), then 1.5 seconds later drop corruption, then 1.5 sec later drop SL, you have put a world of hurt on someone in 3 seconds, and in a BG situation they might have no clue where you are.
It may not be ideal, but I definitely think it sounds like fun, easier to manage than more complex combos, and certainly not a "too stupid to try" endeavour. As for myself, I hope you go for it and let us know how things go.