I would say that not finishing a game should be the exception, not the rule. In general, understanding how a game is paced from start to finish is critical to understanding the overall quality of the game. Imagine if a reviewer only played half of Recore; they would probably give it an enthusiastic recommendation since they did not know about the lackluster second half. The player who picked it up however, would probably feel ripped off. For most games, knowing how consistent the quality is all the way until the end is important.
However, I think there are times where I personally don't mind if a reviewer finishes a game or not (I never really care that much, I would just choose to go to another critic if I took issue):
1. Wolpaw's Law. If the first 2/3 of the game is utterly horrible, I do not care how the last 1/3 turns out, and I don't care if the reviewer knows either. It's totally okay for a reviewer to come to the conclusion that, based on what s/he's played so far, that it is not worth it, no matter how good the rest of the game could be.
2. Really large open world games where the plot is kind of inconsequential. I've never finished Skyrim's main quest. That being said, I have over 100 hours clocked in on that game. Have I played enough to write a meaningful review? I certainly think so. For Bethesda style games, I'm more concerned with how much time they clocked in, rather than if they "beat the game" or not. This is personal, of course. This also applies to MMOs; I do not expect critics to get to max level before writing a review. That could take forever.
3. Rereleases of old games that the reviewer has already played. I count Gamespot's review of the Crash Bandicoot N. Sane trilogy here. After playing half of a rerelease, a critic has a very good understanding of the sorts of changes that have been made, and what s/he thinks of them. If they already beat the original versions, then they already know how the pacing is, and how consistent the quality is, so I don't think its a big deal to beat the game all over again to deliver a valid verdict on the rerelease.
In general though, its a good idea to finish the game, as the quality can change drastically over the course of the entire experience.
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