I think it's relevant though. There needs to be a common denominator between something like Pac Man and Zelda which still defines both as "videogame." Given that pretext, then yes, any game can be felt for as good or bad, favorite or loathed, without the need to finish it.
Take the opposite argument - if someone said they only played an hour or so of Zelda and hated it, never finished it, no one would question it. There's no condition that someone must finish a game before coming to the negative conclusion, so why is there a burden for the favorable one?
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