If the Metacritic helps selling the game to the right persons, then all the power to it.
I enjoy both DAI and PoE immensely. Though they have the same sort of roots, they are rather different today. But both are very good games, and both could be better.
As for Metacritic, no it's not worthless. You can understand the scores.
But the scores are not comparable between games.
The thing is, that those who purchased PoE, first knew what they were buying, secondly weren't disappointed. On the contrary, they were delighted. And every time that happens, the game gets great ratings. Not so strange, really. If you think about it.
The case of DA:I is more multifaceted. No one knew exactly what they were buying. And despite the fact that DA:I follows DA2, rather than DA:O, a lot of people want to punish DA:I for what it's not, rather than judge what it is. That pulls down the score.
Overall, I have to say that DA:I is fairly the better game. Thing is, though, PoE excels in the design of those parts that DA:I wants to gloss over.
Two great games. But at the same time also two sad examples of that the RPG genre really haven't evolved since BG. Not in its own right.
That's really the thing, RPG-specific gameplay and content haven't moved forward. At all.