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Well, it's more because of its cult status (especially on imageboards) than actual objective appreciation.No way. There are nearly 3M user ratings on that website. How many of those would you say belong to regular imageboard users? A few tens of thousands, tops? And when was the last time you saw a Steins;Gate meme?
Also, absolute meme shows which are imageboard fodder don't tend to rank very highly. See, e.g.: https://myanimelist.net/anime/32615/Youjo_Senki (#808 on the all-time list.)
People really liked the Steins;Gate anime on its merits.