I've played a handful, that generally range from pretty good to awful and many of them do that within the course of a few holes.
Walking Stick (Pueblo, CO). Easily the best of what I've played. A good desert-style layout that nicely uses a desert arroyo for a few holes. The integration of the irrigation pond on the back nine is out of place and rather annoying.
Legacy Ridge (Westminster, CO). I only played it a few times when it was brand new and not yet beset by homes as it now apparently is. Also the first place I broke 80, so I may be biased. The front nine offers some very bland holes and some downright dreadful offerings (#6 is among the goofiest par 5s I've ever played). But the back nine I always thought was quite nice, with an interesting tempting tee shot at 10, and some nice us of natural wetlands on a few other holes. Someone previously mention #13 which is sort of a downhill cape hole over the wetlands.
Heritage Eagle Bend (Aurora, CO). I played here maybe twice and over a decade ago ... still there are plenty of such courses I remember very well, and I'm not sure I remember a single hole on this course. Even looking at a yardage book and map brings up nothing from the memory banks. I have a vague memory of not liking the 18th hole here, but to be honest I may be thinking of another course in the area.
The Legacy (Las Vegas, NV). Housing tract golf at its most bland. No glaringly bland holes, no interesting ones, either. You've seen pictures of this course, no doubt, because one of the par 3s has its tee boxes in the shape of card suits. This adds nothing from ground level, of course, but makes for a nice promo shot in Vegas. Yawn.
Palm Valley (Palms) [Litchfield Park, AZ]. Pretty bad, but I don't recall any outright disaster holes. A lot of crowned fairways where everything runs off down into the "desert." I wouldn't drive to the west valley to play this again and wouldn't wat to move to the west side for fear it'd become an easy option.
Quail Creek (Green Valley, AZ). A lot like Heritage, I remember almost no individual holes. Green Valley is essentially a retirement community south of Tucson. This course is probably more attractive than most (or was, when I played it), with less intrusive homes and nicer views.
Heritage Highlands (Marana, AZ). Played this course once because a friend of my dad's had a place there. It had several WTF holes. I asked the guy who lived there if they were, "once you play it a few times, it makes sense" kind of WTF holes. He said, "Not really," and moved shortly thereafter.
Stonecreek (Paradise Valley, AZ). I don't know much about this course, but I don't think it's a Hills original, though he's usually given credit. Think the original course in this spot might have been by the Dye group, and had a different name. A very weird course for the Phoenix area with a lot of water. Lots of homes, too, but at least they're kept to just one side, generally. A couple goofy holes, but some nice ones, as well. There's a good short par 4 on the front (#8) and a good pair of par 5s on the back (#13 snakes around grass hollows and is often reachable, no bunkers and the creek is mostly out of play), then #16 is a beast, very long, into the wind, and with the 3rd shot over water unless you really challenge the hole with your first two shots. Nothing great, but it's memorable.
Camelback (Padre) [Scottsdale, AZ]. Again I believe this is a renovation, but the resulting course is pretty decent given the site. The front has a good par 5 (#5) followed by a good short par 4. A couple clever holes on the back, too. Mostly it's flat and uses water to create strategy far too much (especially for a course in Arizona), but I'd rather play a round here than either of the Muirhead courses at McCormick Ranch across the street.