Nexen are a Korean name brand tire, and have an excellent world wide reputation. They just haven't been marketed in North America as long as, say, Goodyear or BFG, or Michelin, or......
Same goes for Kumho and Hankook.
I put N7000 summers on last season and was very impressed compared to the Yokohama's they replaced at hlaf the price.
A few cars a go I bought some of CTC's Predator tires, put over 100k on them with no issues at all, I believe it was a rebadged Uniroyl tire.
Agreed, CTC's cheapie tire are exactly that, cheap.
The local used tire place was quoting me $50/tire installed and balanced, but no warranty at all.
For $56 (plus $10 balancing) with a warranty, the Nexens at Walmart made more sense.