If you believe what Igromania writes then:

Projects like Eragon are not even games; they are market positions that publishers need to fill by any means necessary. Any film company, when launching a major blockbuster, tries to cover as much media space as possible and uses these kinds of side products for that purpose. And the quality of such products is the least of their concerns. It is pointless to even criticize Eragon —
this game does not try to entertain; it merely dryly executes a business plan


"Eragon is not so much a game as it is a market position that the publisher absolutely had to fill by the premiere of the film of the same name.
It has virtually no independent value"

The game itself was given a score of 6/10

P.S. Please don't throw stones at me. I was only quoting.
I was just away for a long time, so I decided to stretch my fingers.