Smirnoff is a brand, not a vodka- think of smirnoff and you think of the Tv adverts before you think of a drink- when was the last time you saw belvedere or gray goose on Tv?
Smirnoff blue is exactly the same as smirnoff red, except a little stronger in alcohol content (45% rather than 37.5%) and it has a slightly stronger after taste.
Smirnoff is clearly marketed at the uninformed consumer, the person who thinks vodka is vodka. I am something of a vodka snob, and admittedly a really good vodka like gray goose is twice the price, and not all of us can afford to spend so much on our tipple- but I think smirnoff is the most overpriced vodka on the market- if you want a good cheap vodka then drink red square, russian standard, or pay the little bit extra for stoli or absolut, if you have to buy smirnoff get it at duty free for a tenner.
Smirnoff is a mixing vodka, which means it's designed to make a glass of coca cola exciting, or rather a glass of coca cola is designed to make smirnoff palatable. Unlike russian standard, or zubrowka, Smirnoff has no perceivable taste (just a nasty aftertaste), so it doesn't effect the taste of anything you put it into, this also means that if you drink it neat you are wasting your time and you'll just suffer the full force of the after taste.
it's a ubiquitous vodka, and everyone knows it, so bring it to a party and get no funny looks from the guests- but if you really want to impress your guests then bring something else.
The super-premium of the Smirnoff family offering quality and strength.