I wont debate that there are some capable tollers out there. A MH titled dog is certainly something to be proud of. I have seen a lot of them at JH tests trying desperately to get a JH pass so they can breed and sell pups. I personally wouldn't want to hunt with any of the ones Ive seen in the JH tests. The 5 tollers at the last JH test I attended all failed, that says enough to me in such a basic test.
Common issues I have seen include no gos on marks, not picking up the duck, not bringing the duck back, and very little retrieving desire.
Like I said, there are some MH tollers out there, but your chance of buying a toller pup and getting a solid meat dog are pretty slim.