Two pop to mind, neither in particular "good". David Brin wrote "The Practice Effect" which was more or less an update with twists on Twain's "A Connecticut Yankee in King Arthur's Court" (which also might count). Ursula Le Guin wrote one called "The Beginning Place" which had an ending I hated so much I threw the book. I swear, I think someone cut out the last chapter. I haven't read them, but isn't Guy Gavriel Kay's Fionnavar Tapestry basically this kind of fantasy?
I rather like the idea of the portal fantasy, mostly because I like fish out of water stories. Beyond that, yeah, they can be just plain bad because they are SO easily perverted into writer masturbation fantasies (fun to write, and to perhaps share with those 3 friends who like that sort of thing but don't write, but not suitable for public view).
Beyond that, I don't know that I've thought about them.
Edit: Andre Norton -- Here Abide Monsters. That was one I remember liking VERY much, but I haven't read it in so long that I can't recall why.
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I rather like the idea of the portal fantasy, mostly because I like fish out of water stories. Beyond that, yeah, they can be just plain bad because they are SO easily perverted into writer masturbation fantasies (fun to write, and to perhaps share with those 3 friends who like that sort of thing but don't write, but not suitable for public view).
Beyond that, I don't know that I've thought about them.
Edit: Andre Norton -- Here Abide Monsters. That was one I remember liking VERY much, but I haven't read it in so long that I can't recall why.