It seems like most people prefer the park they experienced first.
As you can see, people who have been to WDW first, sometimes think that DL is too small, that the fact you can see the outside world from some spots takes away from the magic, and that there isn't enough build up of excitement as you enter the property.
Since I'd been to DL 50 times or so before ever going to WDW, DL to me is how it's "supposed to" be. I think the opposite. I don't need the outside world to be completely hidden to feel the magic. I think WDW is too big and it takes too long to get from hotel to park to park. I think entering the park is anticlimactic when it takes so long to get from the property entrance to the parks/hotels. I think Cinderella's castle looks obnoxiously huge compared to Aurora's more modest quarters. I find it very interesting that in one of the links above, the writer uses It's a Small World as an example of a less entertaining queue area, when the DL version is housed in that big, animated and entertaining building.

To me, the entrance to the WDW version is the surprisingly disappointing one.
Of course, DLR is not going to have as much to do, because it is smaller overall. DL compared to MK packs more rides into a smaller area, so yea, it'll feel smaller to you, but there will be more to do. Then, you've got only one other park, CA, versus three plus two water parks. We are a family of thrill ride junkies, so we actually prefer CA to any one of the other three parks at WDW. Again, overall we'd spend more time at the other WDW parks, but doesn't mean we'd enjoy it more.
In general there is no real difference in cleanliness or patronage. Rude people (as well as nice ones) frequent both resorts. Size is really the biggest difference IMO. If you're looking for a week of only Disney, DLR might not be it for you. If you want to split the stay -- 3 days at DLR, 3 or 4 at the beach, it's perfect!
But other than size, IMO, it depends on what you're looking for and your expectations. Read what everyone has to say about what they didn't like about DL, but don't let them convince you not to go. Use it to learn what to expect, so that you don't let surprises take away from the magic.
