The polls were right in 2018. I don’t want to hear spin about Trump not being on the ballot then.
2018 was won with voter fraud in southern CA.
If you're going by the final polls, they were largely accurate. I don't think you'd find that they were as accurate if you looked at the June polls. Certain ones were way off right before the election. For example, Quinnipiac announced that Gillum and Nelson both had 7 point leads in FL in their final polls.