The Summit could be a great area if they would just focus more on the core product: lifts and snow. Booth Creek has invested tons of money in the lodges, plazas, etc. (with the accompanying outrageously overpriced and sub-standard food offerings) but has neglected everything else. Lifts are getting old and show it. For an area as low as this I am continually mystified by the lack of snow making (the coldest nights are usually the ones w/ no clouds . . .), and the grooming has suffered in recent years as well. It used to be a great place to go at night (shorter lines, uncrowded runs), but they are beginning to price it such that the value proposition is questionable (even if you do buy the "cheapest pass in the NW"). I should also mention that the lift ops (and other staff as well) are the most inattentive, lazy bunch of ski area workers I've ever seen.
As for each area: Alpental - sickest terrain, but SLOOOOOOW lift to access it; West - good for families and learning (but CROWDED); Central - all the best runs serviced by SLOOOOOW chairs, and the nicest face off the HS lift (Bonanza) was sacrificed to the terrain park so it is un-skiable any more. East (Hyak) has some sweet runs but due to the SLOOOOOW chairs and low elevation can be questionable on all but a total powder day.
All in all, unless you are a total terrain park person (they really have done a nice job w/ that) any other area in WA is a better value - especially if you're paying full price.