Loads of people complain about stalled brews, estery brews, fuselly brews etc - especially the noobs for whom you want to make things simple.
Common culprit - underpitching so yes I can, you can, we all can notice the difference.
You pitch a doppelbock with a single pack of 6 month old yeast and tell me if you can.
For what It's worth, I don't use mr malty and often find the amounts suggested way over what I find practical to use and mostly my beer turns out well (including some comp winners). You seem to be just taking the opposite end though, with no qualification and offering no justification - just 'it's fine'.
Well sometimes it isn't.
I've also noticed an improvement in flavour and fermentation in certain brews that required bigger starters (high grav etc) so that's the other bit of anecdotal evidence to deal with. Have you ever tried it and noticed an IMPROVEMENT in a beer? I have.