I've actually had cigars that I couldn't stand the frist 1/3, which turned into one of the best cigars I've ever smoked after finishing it (LFDM Chisel). I was VERY tempted to toss it close to the beginning, but held in there (it was VERY spicy at first). Now I know what to expect with that cigar... (It is a POWERFUL smoke!!!)

I'd suggest you tough it out to the end - then make your mind up about the cigar - unless it's so obnoxious you can't take it. And I'd try the cigar a second time if it wasn't REAL bad, just to make sure you didn't get one bad one out of the bunch (it happens from time to time).