This backs up what I've seen about the game myself; Nightreign's nowhere near perfect, but it's got enough going for it to at least be some fun. The game's more heavily designed for co-op play rather than solo; bosses are far more manageable with a group, not to mention the horde fights and the general exploration and looting that's encouraged. Despite this, there's no in-game chat or crossplay, which makes finding a solid team a good deal harder, and randoms are well-documented as making the game a bit more frustrating. Also, the game's got a rep for being a bit repetitive overall, with the game basically only two real modes - either the main BR-esqe mode or the Remembrances, which are character-specific memory missions - and a pretty good chunk of the map variants also end up reportedly vanishing once you beat the main story. Character builds and general loadouts also tend to gravitate towards going for specific gear, with the best-in-slot pieces often being from the Remembrance missions mentioned above.
Despite these issues, the general vibe I've gotten is that the game is a fantastic groundwork for updates; there's a lot of general potential for From to tweak certain things and make the game far better, and since there's at least one DLC update coming in the future, it says some decent things about this game's future. Basically, as long as From doesn't just ditch the game once it drops and actually listens to the community, there's a chance we might be able to get a solid game out of this.
I still can't fathom who would want to have ER difficulty, only you need 30 minutes to retry bosses. The only real solution is finding cheese that trivialise the encounters (which admittedly is very much a feature in ER). I wouldn't be surprised if the balancing is still shit.
Believe it or not, there's a bunch of lunatics in the community that're into that type of shit; you should see some of Sekiro's community.
Fortunately, new players aren't completely left in the cold; the Nightlords are all noted to have specific elemental weaknesses, which the descriptions of each before you go to fight them all making it fairly obvious as to which one's which - Libra being weak to Madness, for instance. These elemental weaknesses tend to REALLY do some work; fortunately, you can check the map and find guaranteed locations for elemental weapons, as well as some mines for upgrading said weaponry when acquired.
