I uhh... completely disagree on pretty much all those fronts, actually. Especially compared to Dark Souls 2.
For level design, the levels all looped together believably in Bloodborne, particularly when it came to the shortcuts. They also had plenty of little side nooks and crannies, oftentimes ones that you could see well before you could reach them (which encouraged you to explore to find them). The only area I wasn't a fan of at first was the Forbidden Woods due to how easy it was to get lost in, but then it clicked that that was the whole idea. The only time I ever felt the level design was good in Dark Souls 2 was the Brume Tower; The rest was usually underwhelming at worst, and meh at best.
As stated elsewhere, I liked the limited weapons in Bloodborne because each one had a potential use. Each one feels like it could be good for someone's build (particularly with the new batch with the DLC). This is far from the case in Dark Souls 2. I concede that the armour variety is a bit lacking in Bloodborne though (not that the majority of the armour in the other souls games really served a purpose either).
As I said elsewhere (again; it's almost like I'm repeating myself) I didn't care for the magic in the Souls games, so I'm squarely in the "good riddance" camp for the magic aspect of Bloodborne. Hell, they nerfed the only spell type I even liked in DS2 SotFS, I used it even less there than the first playthrough!
As for the cheaply designed bosses... hahaha. They all have plenty of tells in Bloodborne, they just tend to not last as long as the ones in the rest of the Souls games (although I vaguely recall some of the bosses in DeS having shorter tells like these... I think, it's been a while). Dodging seems to work perfectly fine to me. DS2, on the other hand, I still got hit plenty by things I shouldn't have been hit by. Sloppy input lag didn't help things either (which I didn't experience in Bloodborne, I should note).
The story and lore is fine... it's actually plenty deep, although it seems to be even more vague in certain instances than the Souls games.
On the technical side, I actually find it to be a lot more solid than DS2. The controls are solid, as is the combat. DS2 felt like it wanted to be faster than DS and DeS, but the actual engine behind the game couldn't keep up which led to a bunch of issues. This is why I'm glad DS3 is running on a modified version of the Bloodborne engine, it has a chance of controlling normally instead of running through molasses.
Bloodborne is shorter than the other games, yes; but I have fun the whole way through. When a game feels like a slog like DS2 did for me (both times I got all the achievements/trophies), it feels more like a chore than enjoying my little time off. In the end, this is the most important aspect to me.
You can not like Bloodborne as much all you want, but I just don't agree with your reasoning. We'll have to agree to disagree on this one.