I would abort. I had to rewatch the season three finale and then do a bit of reading to catch up/remember anything at all, but if you have enough context, the first half or so of season four is actually pretty good. That said, the two-part series finale is literally the worst finale I've ever seen, and I'm not exaggerating (I go into more detail on the previous page, but with spoilers). It's so bad, to the point where it basically/retroactively ruined the entire series for me. Episode 10, I think, is actually pretty good, and felt like a true/worthy ending to the series. But the three episodes after that are pure nonsense, and will only serve to piss you off even more, IMO. Proceed at your own risk.