Review of I'm Standing on a Million Lives
Standing on 1,000,000 lives is far from a generic Isekai in a number of important respects: 1) It pays far more attention than any other Isekai i've seen so far on the question of why an Isekai world might exist and why 'players' might be summoned there - yes, these questions are still unresolved at the end of the season, but the characters frequently wonder what the hell is going on, rather than just going 'oh, i'm in a game, cool - let's slay some slimes!'. The basic question of whether or not the 'game world' is even real leads to some arguments and soul searching initself and it has to have props for that alone.
2) The cast are not all immediately friends or harem rivals, there is some tension present and only 1 supporting character gets really interested in the MC during the whole series. Not only this but the cast are not even terribly likeable, with a misanthropic and depressed MC explicitly valuing the lives of his two female comrades over his own and number four (another girl) being pretty contemptible as well as judgemental and useless.
On the other hand all this leads to interesting interactions and actual character development, as the different characters get to see what their comrades are made of and sometimes surprise themselves.
3) The characters are decidedly underpowered, rather than OP, with two of the three being out-of-action for most of the third 'quest' while the MC desperately tries not to die as he works out a way of beating a creature that clearly outclasses him.
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Apart from this, yes the whole set-up is fairly generic on the surface, with 100-man taking the 'MC gets a raw deal' route rather than the 'MC is totally OP' option. There are classes, levelling-up, and since this is set up explicitly as a 'game' there is even a Game-Master handing out the quests. Except that he's a deliberately obtuse jerk and appears to be handing out all the crappy classes to inappropriate people and setting nearly impossible challenges.
The difficulty of the quests is likely the reason for the title. The characters die and respawn a lot and while the experience and process is painless and game-ified as opposed to the heart-rending suffering of Subaru, it does create tension as a total-party-kill will apparently end in everyone's death; plus the characters are underpowered school-kids despite their designation as 'heroes' (one of the girls is classed as 'warrior' but can't even lift her longsword) and you can't simply respawn if your body is compromised e.g. by being in a troll's stomach or frozen solid by a blizzard.
The production values are average, with the art style being run-of-the-mill, but the character interactions/development and potential for exploring serious questions about the genre made this well above average for me overall.