Yeah it is good and I think the cross-over appeal of the books and tv series is evidence of that. GRRM is a good writer who’s written some outstanding stuff over the years.
One feature of the books is that magic / supernatural stuff is quite low key, so very different from a lot of fantasy novels in that respect, and also a reason for their broad appeal. Large sections of the books read like historical fiction. Ironically, one thing that GRRM is not particularly good at is the traditional world-building you see in fantasy novels – the books are entirely driven by his writing so the opposite of the usual bollox you see on the SF / fantasy bookshelves.
Unfortunately, the series as a whole looks to be heading for the rocks, as GRRM has lost his grip on the latter books in terms of their overall structure (although they’re still fun to read). The first 3 are excellent though.