Your opinion is instantly invalid.
Blade of the Immortal is awesome. The character development, the plot, the art, everything is superb. Definitely one of the best things to come out of moonland.
I love Berserk, Vagabond and Vinland too, BTW. But to complete the top 5, Lone Wolf and Cub, not fucking Hellsing. Seriously, the manga is terrible. How can you complain about BotI's plot if you consider Hellsing to be good?