Of course, one should not get butthurt that what they really like is not on the list. Nobody can tell you what you like. Nobody but you can decide that Skyrim is your best game ever just like no IMDB list can tell you that you are wrong for loving Avatar over any other movie.
But one also has to respect opinions of others and accept their view on things and reasons behind those views.
Just when I thought I was out, you go and pull me back in! Hehe
Did I hear someone mention stats? IMDB? Ok, here we go:
The closest the game industry has to IMDB is the much ignored Metacritic ratings, in particular the user ratings which copy the 'out of ten' premise of IMDB. You are right though that it's not really ideal, because it's used so infrequently and because game players haven't yet mastered the art of not giving everything either a 0 or 10. I have no idea why games induce the inner fanboy so much more than movies, but my best guess is that because film critique is taken seriously whereas gaming critique tends to boil down to who's paid what to whom
Anyway, I looked at all the codex top 20 on Metacritic's user ratings and Arcanum doesn't really hold up against the really big hitters:
11 games from the codex's top 20 score better than Arcanum.
The games that score the same as Arcanum are: Fallout: New Vegas, Gothic and, because I also looked up the games I thought had been cruelly missed out, it also scored the same as King's Bounty: The Legend.
Which is about right IMO, they're all games which have some specific novelty about them while not necessarily having that magic sauce to be an individual giant.
The giants from the codex's list being games that scored 9.0 or more, such as BG2, Witcher 3, PS:T, Fallout 2, Dues Ex. With games like Gothic 2, Morrowind, VtMB and BG biting at the heels at 8.9.
Some other interesting stats from there:
Avernum: Escape From The Pit scores the same as Knights of the Old Republic 2, The Banner Saga scores the same as Age of Decadence.
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Now, I have issues with Metacritc as well, of course, but I find no complaint in the comparisons I've made above, even if the scores are ludicrous, the like-for-like comparison actually works for those I've highlighted from a more objective/academic critique standpoint.