I have yet to hear anyone say that they SUCK... They've told me there are a few "eccentric" and "odd" sections, especially in the "Nothing Lasts... But Nothing is Lost" album (my favorite by the way).
I've been into Shpongle for years, but haven't listened to anything recent. Is their new stuff as good as their old? They (and Simon) basically wrote the book on ambient psy-trance.