Looking at the Wiki summaries, there are only a few spoilers in them, but they're still spoilers I'd try to avoid as a first-time viewer.
From where you are in the series now, I'd take it on faith. If you're still watching the show now then it's not going to let you down in the remainder of the series. There are a few duffers, but generally, the rest of seasons 2, 3 and 4 at least are incredibly strong. Season 5, starts slow but starts gathering pace towards mid-season, and the final 5 or 6 episodes are as good as anything that's gone before.