That's really the point he was making. Even if the Vespid wipe out a 5-strong unit of Devastators (itself unlikely), they'll then almost certainly be within 12"-18" of something else that can casually wipe them out in turn. You'll get one round of shooting, one shot per model, and that's almost certainly going to be it. How far the Vespid can then move is probably immaterial as they're unlikely to survive...

And my point was that I've been using Vespid in my lists for over a year and they aren't as fragile as he is making them out to be. I rarely only get to shoot with them for a single round, it's almost always two rounds of shooting, sometimes more depending on how my opponent reacts to them. Truth be told, a fair number of opponents choose to ignore them and focus on the "much more powerful" crisis and broadside teams, letting the Vespid get in another round or two

Having run vespid I can say that even a marine unit weakened by vespid shooting (assuming 11 vespid, 6.5 marines (if they have no cover) rounding down to 6) can wipe them. 4 double tapping bolters would kill 3 vespid, flamer (assuming 4-5 hits) could kill 2-3 vespid, missile launchers (assuming 2 hits) would kill about 1 vespid. So 6-7 dead vespid. Or they could fire their pistols and charge (they'd win). And this is if the sergeant doesn't throw his grenade and decides to fire his bolter instead.

So you see this is tipped heavily in the marine's favour.

A ten strong marine unit would likely wipe the vespid, getting roughly 10 kills in one round of shooting. And they can shoot before you even have range.

Fair enough.

Speaking for myself, if my enemy ignores my unit A in favour of unit B, it's either because (1) he's never played against A before and doesn't realise how awesome they are [note - this only ever works once], or (2) unit B really is a bigger threat.

If you're finding your enemies ignore the Vespid a lot, it might be because (2) is true.

I wholeheartedly agree that Crisis teams are a bigger threat than Vespid, and I don't believe I have ever tried to imply otherwise. But we are allowed to take only so many elite/HQ choices (and the HQ ones are often more expensive than they should be). Count that with the fact that certain missions count Fast Attack as scoring (something crisis teams can never be) and you can make a reasonable case for running Vespid in 6th edition.

More reasonable than before, certainly; on that we are agreed.

(I'd still take Tetras and Hazards long before Vespid, but if your gaming group doesn't allow Forge World that's obviously not an option).