If your internet isn’t great then it won’t be much better for you vs torrents.
I get 1 gbps and my usenet host can fully saturate my download speeds.
My usenet host retention is currently over 5000 days. Most downloads that fail are because of DMCA takedowns. In those cases, 99% of the time, Sonarr or Radarr will find another one still under the same provider. It’s only when all of those fail that it’ll turn to torrents.
I can count on one hand the number of times I’ve had to use torrents in the past three years.