WoT is, in a weird way, more interesting in summary than in detail. It has some cool world-building going on, and an array of very compelling players on the larger field of the overarching plot. But it also has a lot of overly detailed deep-dives into errant strands of half-formed mythologies (like e.g. the Great Hunt, or most of Tel'aran'rhiod) and a very, uh, "generous" overall pacing. It feels like a bit of a chore at times, and frustratingly drawn-out. 13 books is simply too much (and that's not counting the prequel) for what is really a fairly standard good-vs-evil narrative. As a result of that bloat, there's a few unfortunate tendencies that can be observed, like e.g. power inflation for characters.
It's not as detail-obsessed as the A Song of Ice and Fire books (GoT) but certainly there's a lot of uncompressed plot floating about that could perhaps have been condensed neatly without too much loss.
I actually use WoT when teaching narratology as an example of narrative running rampant, in contrast to e.g. The Lord of the Rings where epic scope can still be contained in a reasonable narrative length. I'm not sure if the size of WoT would work for it or against it in a TV adaptation. On the one hand people will undoubtedly get bored; on the other hand, there seems to be a kind of boundless appetite for content. Hard to say, but probably irrelevant if they botch it in other aspects, like it seems they are...