Yeah it's a little gimmicky, but...the shape of the can-glass does a great job in concentrating foam, which in turn enhances the visual appeal of a beer. And never underestimate how the visual appeal of a beer in a glass affects the perception of how that beer tastes. That said, the shape of this glass doesn't really enhance aroma, so IMO it's more suited for beers that are less aroma-dependent.
The shape of this glass does not make the beer dribble down your chin any more than any other shaped glass. You might still dribble beer down your chin, but it won't be because of the shape.