As someone who has read over 200 novels (granted some have been as short as only 200 pages) I can say that even if the TES books are not the best books you can get there is still some entertainment value to be found in them. Instead of thinking "I'd rather read..." I recommend just reading both
worked for me so far.
I suppose somewhere there's novels based on some licensed, franchised property originating in another medium that have turned out to be acceptable beach reading...but they're rather rare. I've indulged in this sort of thing myself. I read tons of Star Trek novels as a kid, I read those awful Timothy Zahn Star Wars novels later in life, I read the original Dragonlance novels back in the day, I even read some novel by Gary Gygax in high school. So I'm not coming from a place of elitist snobbery, looking down on popular fiction or something. It's just that I've found the acknowledged greats of the genres of science fiction and fantasy to be so much more satisfying than these novels that are written about licensed properties, that inevitably end up being pure fan service.
Not everything translates to another medium. Jaws is a great movie, but it was based on a fairly forgettable beach-reading novel; ditto for The Godfather. I can't imagine Moby dike translating into a movie without missing everything that makes it a great book. And almost no worthwhile superhero movie has been based on any specific comic, except The Watchmen. 300 translated well, and Sin City fairly well, but I can't imagine anybody trying to put The Dark Knight Returns on the big screen without being anything more than a hot mess.
Ditto with games. Mass Effect is great, classic science fiction...but I can't imagine a Mass Effect novel being anything but very bland, middle-of-the-road stuff compared to great sci fi works from Heinlein, Asimov or C.S. Lewis.