I just don't think that it's all that important to search out an outside opinion. If something is truly mind blowing but not on your radar, you'll hear about it casually through friends or coworkers (or, with comics, by the million threads it will spawn on here).
The absolute worst case scenario for not checking reviews on something before hand is that it's not to your liking. You won't die or suffer any trauma from not liking something.
The inverse though is that you'll pre-judge and sour your opinion of something you may have enjoyed by attempting to inform your personal tastes on the critera of another person.
I'd rather look at everything in an equally positive light from the get go than the latter. I've found that I'm either easily satisfied or I'm a much better judge of my own tastes than any reviewer.