I tried it along with red mountain and Kragh a while back just because I thought all the proc was hilarious. It's an extraordinarly average set imo. I guess you can have fun with it, but not be very competitive. I don't use anything that procs anymore.
I run it on my stamsorc, though granted I really only use it because I like the birds and it fits the theme of that character.
I've had the birds crit for over 10k, and the proc is reliable. It doesnt do much in aoe situations, but in single target the 5 piece is adding roughly 2k DPS, sometimes more depending on luck with crits. It also offers penetration for one of the other set bonuses, which can be valuable.
It's not a great trial set, but for soloing or 4 man dungeons it's pretty good. That's where you have to make the distinction, the only time you need group buffs is when you're working in a trial setting, you'll always be better off with a 'selfish' set in any 4 man content, and obviously when solo.
It really isn't "bad very bad"...there are certainly better sets, but honestly, for me, switching from hundings/spriggans/kragh to unfathomable/spriggans/selenes, my dps hardly changes at all. Crows contribute about 1k dps for me. And the 3 pc pen bonus is nice. Replaces kragh bonus, or one sharpened wep. I'm not doing vet trials though (obviously) but for vet dungeons or normal trials, its been fine for me when I just want something different. 5 pc bonus could use some love for it to be "good" though, maybe.