There are so many amazing fantasy novels that need movies or TV shows. Tolkien was good, and for his time, amazing. But compared to what we have available today, I wouldn't even put him in the top 10. sigh
I tend to disagree. Very few live up to Tolkien's level. And it's not about the brand, it's about the depth of the settings he created.
One advantage of worlds like Westeros and Middle-earth is that they're pretty much immediately familiar to most Western readers: they're basically just a condensed version of Europe and its immediate vicinity -- geography, history and all. There are some amazingly detailed settings which are more difficult to feel immediately connected with, and some of them also feature amazing stories with great characters -- Ursula LeGuin's Earthsea is a prime example (yes, there was a TV series based on it, but we should collectively forget about it; it got wrong everything it could).
As I've said elsewhere, one of the best fantasy series I've recently encountered -- and IMO ideally suited for TV treatment -- is the Liveship Traders trilogy by Robin Hobb. While technically set in the same world as the much better known Farseer Trilogy (and its sequels) it is a completely separate, and IMO much better written story.