That is fairly large for a shotglass. But I guess it's not quite gigantic or anything either.
The malt liquor gives you a good combination of both. It has high liquor content and it's something you can drink easily and in large quantities. Between those two factors you have a beverage that really gets you drunk fast. Which is why malt liquor is one of those things most people drink to get drunk, rather than to enjoy a mild intoxication or a "social drink".
It's also why you don't see most people drinking several shots in succession. The people that do that aren't likely to be up to much of anything afterwards. Shots helps prevent people from getting too drunk too fast. Small shots that you'd find in bars are also part of that. Bars make their money off drinkers, not drunks.
