I can see why people might enjoy dubs on shonens, sci-fi, and other action packed shows. Together with a good lineup for the voice acting, a dub might be nice once in a while. And there are always some parts in a show where multiple characters are talking and only every other line of the background characters are subbed. Maybe I'm asking for too much lol. But for the most part, dubs come out awful... some people just may not notice if they don't watch enough subs, or prefer their native tongue. By the way, a warning to all of you, avoid Funimation's dub on <IS> Infinite Stratos. I watched half of the first ep and the voice actors they lined up were horrible

But if you enjoy slice-of-life and comedy, dubbing is an unspeakable evil lol. How else would we be able to enjoy all of our japanese puns, lingo, and jokes?
Plus, at some point after watching tons of subs you'd adjust to reading the subs fast enough and even recognize key phrases so that you wouldn't need to read most exclamations and skip half the words in some sentences. Although the "-monogatari" series will truly put you to the test