Scepticism about Vegetius\' analysis of the Late Roman Army?

[Thiudareiks Flavius]

I've just done a search, but I can't find where this has been discussed before.

Many people cite Vegetius as evidence that the Late Roman Army had seriously declined in quality by his time. I've got the impression that many modern historians feel that Vegetius needs to be taken with a grain of salt on this issue, but some - eg Arther Ferrill (a writer I think is fairly pathetic, but anyway) - hold him up as evidence of the supposed "decline of the Roman Army".

So is there a consensus on the reliability of Vegetius? References to detailed analysis of Vegetius would be greatly appreciated.
Thanks in advance,