I'm annoyed that I've committed myself to this trilogy. I'm being told I should abandon it and read something else, but I don't think I can now (does anyone else feel that way mid-series?)

I'm going to read the third one, but unless it really pulls something out of the bag (which the last 1450 pages haven't convinced me it will) I don't think I'll be recommending any of the expanded Dune universe.