I think a lot of this depends on your proximity to good beer in general. Anyone brewing in N America is overly spoiled for choice. You (in general) have local craft breweries within driving distance (don't drink and drive please). You have grocery stores stocking at least 10 drinkable stalwarts of the craft industry. If you don't live near a really great local brewery, you can always fall back on classics like Sierra Nevada or even Sam Adams.
If this is the case for you, your brewing experience is rife with sensory overload and a million and one examples of what you'd like to drink/make. Contrast that to those of us living in beer wastelands (I am in Romania).
Beer here is essentially a binary experience (and not on a good/bad selector). There is pilsener (blonda) and wheat (nefiltrata). That's it. If you're fortunate enough not to live in Bucharest, then unfortunately you do not live near a craft brewery. The grocery store has an immense beer aisle, even with a domestic/import split. But what do you find in the import section? Pilsener or wheat. German knock-offs that aren't fit for consumption; Belgians so over-priced I swear I've seen the same individual bottles in their cacophonous disarray on the shelf every week since I've been here (coming up on 125 weeks now...).
The ABInbev buyout is beginning too, but there are no local gems to be bought. There are Australian crafty beers that taste like someone farted in a Foster's and left in in the outback to boil. There are the usual suspects: Heineken (and every horrible thing they own), Grolsch (good for swing tops; bad for drinking), Guiness (long-time sellouts). Then there are the honey traps: Mort Subite - a Lambic! In my haste, I buy it, chill it, pour it, drink it, gag, spit, read the label, reel in disgust at the beer-flavored syrup whose main ingredient is an illusive "lambic aroma".
In short, if it's so hard to make bad beer, why are so many professional breweries doing it? I may be biased towards my beer. I have to be. I know I have made some mediocre ones, but with all the rat poison on sale, what recourse do I have? That being said, I do make a very nice IPA every now and again. I don't need BJCP scores to tell me how good it is, when my taste buds, worn out from long battles with the local swill, jump back to life at the first sip.
Long live Homebrewing!