On the right person these will of course look great. This blog, though, is called Life Over 35 and for that reason if none else I won't be buying a shirt with a particularly loud pattern. The reason is simple; I've pulled off the remarkable trick, at 47-later-this-year, of not drinking much beer but growing a beer gut nonetheless. Of course I'll be working on getting rid of it (and how often have I said that in the past) but for the moment anything that draws attention to it - like a really loud pattern - is out.
There are many myths about what clothes to wear when one's become a little bulbous. Most are based on the principle that vertical stripes are slimming. This is rubbish; first tests have proven it doesn't work (look at a square with vertical lines through it and another with horizontal lines and the majority of people will find the horizontal version looks thinner when the sizes are in fact identical - so vertical lines are fattening) and second a set of vertical lines over a belly actually ends up working like a contour map of your shape.
The jeans I highlighted from Wizard before Christmas are good in this respect in that they're well cut and very matt black - my wife tells me they're slimming on me. Blocks of colour are always good if you're less than confident about your shape. Combine with a casual top from Fat Face (the Henley top in that link works well on me with a white or off-white tee underneath it) or the one I highlighted from Sea Salt last year (I have bought one of these and it works well as very casual - although they seem to have sold out now) and you'll look fine.
I suspect the MSN site is aimed partly at a younger constituency. Early twentysomethings do indeed look great with a bit of a swagger and a loud shirt. Standup comics and TV presenters often get away with it because of the context; Paul Merton wears something with a fairly extreme pattern most weeks on "Have I Got News For You". If you've worked hard enough to have an athletic build then the chances are you'll look pretty damned good, too. For the rest of us I still recommend blocks of colour.