I like Fauna. I've been a fan of Haken since Affinity (easily in my all-genre 2010's top 5), going backwards I loved The Mountain and some older songs (Crystalized....). Vector was a bit too "metal" for my tastes (I love some extreme bands, but I prefer Haken - or DT - when the hard-rock/Rush influences are proeminent) but the quality was still high. Virus was a step down even if the highs were very good in my book : Invasion, Carousel, Canary Yellow...
I wasn't very warm at first with the singles, but in the context of the abum, it flows very well. I regret two things : I'm a guitar solo lover, I miss it compared to the Affinity period. And the bass sound is too much processed, synthetic for my taste.
Affinity is such a good disc... It mixes classic prog-metal with some mainstream influences (I hear bits of Anathema, Porcupine Tree-Steven Wilson, of course Rush and DT), with 80's synth-era soundscapes, the songs have multiple connections (Initiate - The Architect - Bound By Gravity, 1985 - Endless Knot) both lyrically and musically, it reminds me a lot of Images and Words / Awake.