Do you think so? I actually really liked it, I found that it was good pay off from Seasons 1 & 2 to have a lot happen in all the episodes of the last season (plus Gavin gets bored of TV shows really quickly so it helped me out a bit too)
Spoiler:
Even though it wasn't satisfying (but not in a bad way, if that makes sense) I liked that we saw that most of the characters simply don't exist in the real world because their existence is reliant on paradoxes and it took me a few minutes to realise where most of the cast was and just how many characters simply don't exist now.
If it was down to me, I'd have had the third series be based around Eva and her world and a shorter fourth season be based around undoing the knot. It felt like they were running out of episodes towards the end and, while I enjoyed it, the last but one episode gave me whiplash by how fast it went through the timeline, explaining everything
I think a lot of characters also got the short end of the stick too because there wasn't enough episodes to cover everything properly. A five or six episode season 4 would have been perfect, I think.