I've been hesitant to post a reply regarding "it doesn't matter who makes the beer, as long as it's good," and more specifically Lutter 's post on the "craft beer mentality needs to die." Granted, I don't know you Lutter, so if this is you being sarcastic, my apologies.
Craft beer mentality is one focused on building a community through beer. It's not about the beer, it's the fact that we come together because of beer. There's a clear passion, hence this website which was born due to the previous one becoming the opposite of which their name implies. It's a life style choice that doesn't just center around the beer you drink, but also which restaurants you eat at to where you buy your groceries and many other facets of your daily life.
As others have mentioned, a concern is being overlooked/squeezed out by distributors, but the one that consumers typically don't see is the raw material side. This in particular with the SABMiller/ABI merger in Europe. Now, more than a 1/3 of every beer sold in Europe will be SAB/ABI beer. Which means as they grow bigger and bigger, that's less grain, less hops for the small guys...especially if the small guys can't buy enough for contracts. And if they can't set up contracts, their spot buys are even higher. Thankfully, due to the craft beer boom in the US, we've literally changed the hop growing industry. More and more acreage is being dedicated to aroma hops, instead of high alpha which was directed by macro brewers. As industry trends are indicating, growth seems to be directed towards smaller, hyper-local breweries/brewpubs, e.g. Portland. Which is exciting, but at that size, competitive pricing makes it difficult for those guys to succeed. Which is why I believe it is important to know who is making your beer.
But like the 40 Year Old Virgin, I tend to put beer on a pedestal.