According to what's in them, I'd say a weightgainer may or may not be good for post. I don't believe in classifying a carb as crappy but either as appropriate or inappropriate given the circumstances. Both immediately before and post are good places of those high GI carbs. The high GI carbs in most weight gainers are primarily malto dextrin. Maltodextrin can be good immediately pre and post. For preworkout coming 45 minutes to an hour before, imo, Low to Medium GI carbs are better than the malto and other carbs found in most weighgainers.

A lot of weightgainers also contain casein. Casein is not a good protein for post because it slows down absorption too much. It is certainly better than nothing post but not as good as a whey or fast absorbing source of aminos. Some weightgainers only contain whey and may be OK for post. Likewise for immediately pre since it's gonna be sitting in you stomach and robbing blood from your muscles as well as not being available for quite a while.

A lot of them also contain some kind of fat. Same problem as casein.

On the subject of weightgainers in general I wouldn't make a habit of them but it is important to keep in mind that the content of a meal as a whole has to be figured to arive at the GI rating and not just the GI of the carb source, although the different carbs in a meal have the most influence. It is possible for a weighgainer, while containing high GI carbs to actually come out as medium on the scale because of all the other stuff in it. They can be useful but most people can easily make a more healthful weightgainer of their own.

So, if your were to use a weightgainer around your workout, imo, 45 minutes to an hour prior would be the best place but not optimal in terms of carbs. For a pre workout meal in that time frame lower GI carbs would be more ideal. I don't think most weightgainers are a good choice for post at all since it is very easy to obtain the quick absorbing protein and carbs that are more optimal for this period.

However, while I do believe that certain preworkout practices may be worse than nothing at all (although good preworkout formula is VERY important) in terms of post workout something is always better than nothing. So a weighgainer for post would be an improvement for someone who usually did nothing.

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If you act sanctimonious I will just list out your logical fallacies until you get pissed off and spew blasphemous remarks.