Let's take a trip back to 2007...
Sure, the game wasn't perfect. Some special attacks, particularly the Medium variations, were unusable on 1 on 1 fights due to the long start-up times, and the addition of cards was a part of contention for a few players, and I regret admitting that I was part of the snobbish 'no cards allowed' crowd, or the fact that players using the 'Simple Input' mode had an advantage when it came to blocking, but in the grand scheme of things, the game was fantastic.
And then it came out.... Well, y'see, The Blade of Fate was a fantastic game because it could be played competitively and most characters, barring Joke characters, stood a chance against any other character. But... it seems OUR version of The Blade of Fate was rebalanced for the North American market, as the original Japanese release was a bit of a mess... When it came to Dark Souls' turn, we got the exact same build Japan got, albeit with new bugs, and it wasn't pretty. Byakuya got nerfed, which was a good thing, but he was still a bit too good. Ichimaru Gin wasn't particularly strong back then(Mid tierish) but he nerfed into a pale shadow of his former self, still usable but unjustly nerfed. Other characters got off better, Ichigo definitely got slightly buffed, Renji as well, which sounds fair enough... until you get to Orihime and Ishida. To be fair, Ishida could be annoying on the previous game, but he wasn't too strong, in this game they nerfed his ability to spam arrows, which was fair enough, but they also nerfed his damage making him trash. Orihime now takes 0.25 more damage than other characters and deals a pathetic amount of damage, making her useless. And humans can no longer flash-step on air, which makes them sitting ducks, although at least they can flash-step into combos
As for the new characters, some of them... felt kinda lazily made. Izuru, Kira, Menos Grande, Grand Fisher and the Screamer Hollow all reuse animations between their Normal, Special and Super moves, which looks incredibly cheap. Probably shouldn't have used their budget on trashy, useless joke characters instead of paking polished animations, huh? It's particularly disappointing with Izuru who's got one of the silliest run cycles I've ever seen on a videogame. Ever. At least some of the new Characters are fun to play, as cheap as Kira's animations feel, he is fun to use. Kon might be a useless joke character, but he is amusing to look at, Hollow Ichigo is probably my favorite of the new movesets, as he uses Zangetsu by throwing it around, Don Kan'Oji is a bit situational with his mechanics and specials, but all his animations look great, Matsumo and Kukaku are fantastic new additions and Ikkaku is easily my favorite new character, they even got his Bankai into the game!
But that is as far as my subjectivity goes, because, on a technical level, the game is objectively bad. How about all the glitches? One of the stages is actually missing graphical layers. How the **** did that pass by the testers? It's doubly baffling since this is one of the returning stages, and they screwed it up! Then there's the lot of graphical glitches related to color palettes. There's a few that are inaccessible due to some kind of glitch, it's specially egregious with the Menos Grande which only has 4 accessible color palettes. Or take good ol' Mayuri, with whom a few color palettes makes it so that his arm and face glitch into other colors when using certain animations. But there's a particularly nasty bug, which is very frequent on Survival Mode but which can happen on any non-competitive mode(Unless someone picks 'Random' when selecting a character) in which the game will try to pair you up against '?', rumor has it that it used to be a character that was scrapped, and then the game will freeze.
Bleach - Dark Souls is a sequel that got it wrong.