Even though the album is very short, it's their hardest to digest. With Affinity, for example, the songs I loved on my first listen are still my favorites now (1985, The Endless Knot, Lapse, The Architect), and the ones I didn't like with my first few spins are still the ones I dislike to this day (Earthrise specially). One or two got better with each listen, like Red Giant, which I really like now, but for the most part, my opinion for the songs hasn't changed much through the years.
Vector feels completely different. After my first 2-3 listens, I still felt like the songs blurred with each other, and it just felt like a single heavy/riffy song all the way through. It's gotten better with more listens, but I still don't know how to rank it against the other albums. Definitely doesn't top The Mountain or Visions, though.