I finished watching Continuum. I suppose it was all right. As stated before, the final season is considerably weaker than the beginning of the show. It felt like the producers told SyFy at the end of season 3, "We know the show is dragging. Give us six more episodes to wrap things up." And I'm actually grateful for that. An unresolved cliffhanger would have been annoying.
But the true motivation of future Kellogg's invasion was amusing, especially considering who he was willing to exploit. And I felt like they kept us guessing with present Kellogg's game plan.
The ending felt a little too saccharin, but how else can you end the show? A bleak ending certainly could have been possible, but for a four-season show, probably unsatisfying. Besides, they ramped up the stakes by killing off Lucas and Travis, who had become pretty strong characters in their own right.
I still liked the show. Really strong first season, and that inertia carried me through the remaining seasons. Just like any other time-travel story, paradoxes abound, and you just have to shrug and roll with it. At least they acknowledged surprise that killing Kellogg's grandmother didn't erase Kellogg from the timeline. That set the mood early with the audience to just accept it.