It's okay. All tracks can be fun or unfun depending on a lot of factors, like car, mode you're playing on, people you're playing with... Silverstone GP was home to one of the best, if not the best, race I've ever played.
That said, I disagree it's a track that lends itself to easy overtaking. There're not many spots where you can risk overtaking if the man in front of you has similar pace, unless he does a mistake, of course. At equal levels, I'd say only the back straight is good point for overtaking.
Then again, when you're playing against randoms, you'll see quite a few more overtaking here than in Oulton Park, for example.