Haha, look at the ABV ratings for some of those beers. The strongest beer I ever had was called 'Roger & Out' at the 'Frog & Parrot' pub in Sheffield. That had an ABV rating of 12.9 I think and was served in 1/3 of a pint glass and you got a certificate for each completed glass.
I'd be interested to know what the stronger beers taste like, from my recollection 'Roger & Out' tasted very sugary and treacly, not really all that nice.
The imperial stout can be a thing of beauty. The Utopias in particular is indeed a deep brown thick molasses like syrup on the sweet side but not cloyingly. Its rounded out by years in various barrels (its a blended brew with portions aged in Scotch, Cognac and Port casks) that impart a complex flavor profile - vanilla, caramel, oak, currants, prunes, smoke... and of course a healthy burn to be expected from the ABV. Others on the list slide more toward the bourbon-y side of things - an american thing.
An American barley-wine on the other hand often tastes more like toffee with some earthy spice hops in the mix (American, in general = stronger hop profile when discussing beer... except for "American Adjunct Lager" which refers to the shit that comes out of Golden, Milwaukee and St. Louis among other places.) Its sweet (a lot of malt is needed to get that high an ABV) with toffee and cherry notes and either grassy, musty or spicy depending on the hops used.
Mad Elf is a holiday release from a brewery that I get a 1/6 keg of every year. Its a clear and deep ruby color and made with a lot of malt, honey and cherries and fermented with a spice imparting yeast. Its like drinking christmas dessert!
The wild and sour ales are a different beast all together with some combination of brettanomyces, lactobacillus and/or pediococcus to impart sour and tart flavors. A Belgian creation and called wild because are ferment in open tanks or even thin slabs so that these wild yeasts and bacteria can settle into the brew from the nearby farms and orchards (well, its more controlled now-a-days). You often see a lot of fruitier flavors in these but can also vary from mild and refeshingly tart to a supper-pucker sour that coats your mouth for days (Birrificio Del Ducato's My Blueberry Nightmare for instance).
If I could suggest - pop into the new BrewDog Bar set to open in the Spring in Sheffield - they will likely carry a strong array of international craft brews with some great flavors to try.