Ludicolo is awesome, but it's best used on a well rounded team with good switching options and wish support. It laughs at quite a few things, and leech seed is always cool, but also has some serious problems if you don't have anyone to handle Yanmega/Togekiss. I still wouldn't consider it a 'wall' by any means, though.
The biggest problem with threads like these is they attempt to fill the Blissey 'spot', when they really should be about discussing the various other special walls and their places on teams. It's been noted that while Blissey is incredibly powerful at what it does, it doesn't fit on every team. It should also be noted that it is so common that movesets and EV spreads are created just for pokemon to beat it. Other special walls (that aren't beat by the same things that beat Blissey) have some viability just for that fact alone.
About Blissey being boring: When using it, it is. Regardless of the moveset, it's the same old boring mostly predictable blob. Once the opponent figures out your set, they can run circles around you, and you can't tell me CM Blissey is doing much of anything before that time. However, I don't find it boring to play against, because most good teams have a way to exploit it's existance in the first place. Regarding stall wars, in my experience it's been that most of them end up being two water pokemon rather than Blissey vs something anyway.