If you stay at value resorts regularly, please know I'm not trying to offend! Just wanted to get that out of the way immediately!
Okay, so I've never stayed at a value resort. The first time I went to WDW I stayed at Coronado Springs and every other time I've stayed at a deluxe resort as a DVC member. We booked a last minute trip and the only thing available was Pop Century. I was recently reading a post elsewhere about value vs. deluxe being apples to oranges and how many DVC members would "never stay in a value again!!!1!!" We're a little worried now about staying at Pop Century. I know it won't be awful, but I have a thing about hotels and I get really freaked out pretty easily about certain things including cleanliness. I'd love to hear from people who have switched back and forth between deluxe and value resorts! Please set my mind at ease!!
We've stayed on property several times and Pop is the only value we've stayed at. When we stayed at our first moderate, I was worried I would feel like I wasn't in the magic. I was wrong and we started staying in mods regularly. Last year we took some fo the kids friends with us so we down graded to pop. I was worried the trip would bea disaster and I was wrong again. My wife and I stayed at POP last month on a quick adults only tryp and are ok with it. I'll give my opinion on what I see as the differences in what matters to us.
THEMING and AMENITIES: Sure pop is a "motel" type resort, but we didn't find the theming tacky like some. maybe qutesy, but still nice enough to feel different. Pools are nothing special, but the kids didn't care. We enjoy eating at places other than our own resort so dining isn't a problem. The food court was good for what we wanted on site. We don't spend much time at the resort for this to matter at all. While it's basic, I didn't feel outside the magic.
TRANSPORTATION: This was great. Best bus experiences at any resort we've stayed at on both stays here. Some people will say Delux resorts are more convenient, but it totally depends on your plans. In terms of total distance to the 4 parks, POP is average while GF, POLY, CR and WL are the worst. If you plan to be at one or two parks, then maybe it matters. If you hate buses, maybe it matters. The biggest convenience IMO isn't location, but dedicated buses, which POP has and more than a couple deluxes lack. Pop also has lines for the buses at the resort rather than a general gathreing area...just like at the parks on the way home. Some say it's because of the rowdy guests, but I don't buy it and I actually like it a lot.
ROOMs: This'll be the hardest to swallow. Very plain rooms. Very roadside motel tile in the bathrooms. Framed posters for decor. The biggest issue I have with POP are the somewhat comfortable double beds. If you're fitting two adults in one, you'll get some rest, maybe rest well, but it will not be the best. We've never had an issue with cleanliness, but be prepared for plainness.
All in all, we find POP to be BASIC, but still FUN. We've never felt like we were missing out on something. Given that deluxes go for $300+ more per night, it's hard to justify anymore although the queens in the mods are still a consdeiration. Good luck and ejnoy! A day at Disney at POP is a day at Disney!