Samurai Shodown VI is not a bad game.
Not necessarily good either, but... I can see its pros, and some of good sides. I consider it decent. I do wish it was done better, definitely. But i wouldn't say i dislike it or hate it, i find it just okay. And this is where "good idea, bad execution" comes.
Saint Seiya had a cool idea, the execution was not so great. Digimon Frontier had a cool idea, the execution sucked. A bad execution doesn't mean a bad concept, but yeah. I do wish some things were better.