I've always disliked the presentation of Avernum 4-6. The graphical style of the previous games fitted so well, they were fluid and expressive while conveying a sense of awe and respect for your surroundings. Avernum just seemed so big. With A4-A6, everything got so damned small. In A4, cities were literally two and a half paces distance. It was unrealistic and immersion breaking. A1-3 had all the immersion.
Don't get me wrong, I still like and have completed the last three games, but they've changed so much that it just feels like a Geneforge prequel then a real Avernum game. If somebody remade Avernum 4-6 as scenarios for Blades of Avernum one day, I'd be the first in line to get them. Hell, I'd even pay double for the privilege.
I still play Exile 3 on occasion. The sounds, the feel, the graphics. The nostalge almost makes me cry at times. E3 was the first RPG I ever played, and it still looks fantastic.