Are you saying this game didn't have standards for writing? That it wasn't chock full o'writing? It had standards. The only question is if people liked it or not. Lowbrow monkey cretins didn't, but love games with, in my opinion, far worse writing. If you are so biased and prestigious that you do not think a reasonable person with reasonable expectations for quality writing could think the writing in TToN was done well, and that the writing is bad by objective standards, you are too far gone into la-la crazy land to discuss anything with.
The setting was utterly shit, practically not even a setting at all since it rejected all structure. You can find some ancient powerful wonder hidden away, but no-one will care about it and who knows, there's probably an even older, more powerful one hidden around the next corner too, so why does it matter? Planescape had a lot of random stuff and out-there secrets, but there was still an overarching cosmology, which there isn't for Numenera.
The plot was pretty bad, for example the foreshadowing of the destruction of that big Castoff hideaway was completely hamfisted. When the main macguffin suddenly came spinning into the throne room in the Bloom and the Sorrow popped up too, I was so disgusted by how clearly the plot had been mangled by cuts that I just quit playing right there. The characters were mediocre to bad too, not even interesting enough for me to remember anything about them to criticise. But I do remember reading that the writers deliberately chose to have boring characters as a relief from the out-there setting.
The style of the writing was thesaurus bloat with extra single-use made up words. I can easily read that, but there better be a payoff after wading through all the guff, and there wasn't in this game. Reading it felt like eating lard.