don't think 8/10 is unfair for PoE. it's a beatiful work of art, a well written story and (unfortunately) a pretty basic and slightly boring combat system with some balance issues. i like the story, the setting and especially the artwork, but combat is an important part of the game, so IMO it doesn't deserve more than an 8/10.
on the other hand, i also played D:OS. i liked it a lot when i played it. combat was very fun (though i have to admit i liked it much better than POE because it's turn based. never liked RTwP systems). overall the game world felt less polished in DO:S and a lot of the praised crafting system was totally redundant while on the other hand some aspects (crafted weapons) made the game too easy (crafted weapons were a lot better than 99% of the loot you got from killing stuff). overall 8/10, just like POE.
since DA:I was also mentioned. call me crazy but out of those 3 games, i enjoyed DA:I the most. the combat mechanics are fairly shallow, but i never even viewed it as a tactical game. DA:I combat is easy, but action packed and fun. the story is a bit cheesy at times (it's a bioware game, after all), but it had some epic moments that touched me on an emotional level. essentially it's 100 hours of popcorn cinema. not exactly the same category as D:OS or POE in my opinion, so it's a bit unfair and not very useful to compare the three games, but if i had to recommend one of the 3, i'd go with DA:I.