In my opinion this band squandered practically all of their potential after their first three albums, but I'll still listen to anything new they put out. The Congregation and Malina, for how much I don't like them, each have at least a couple good songs on them.
Ranking the first three albums is difficult because while Bilateral has the best sound and the highest peaks, it's also a lot more inconsistent than TPS and Coal. Honestly, if I had to pick, I think Coal would be their best album overall. The only songs from it I'm not too into are Foe and Contaminate Me, neither of which are bad.