That old complaint IM? Get over it! They're only "horribly oversized" if you insist on all your figures being compatible scale-wise. As a line, the DCD figures look great together, and I have no need to display them with other lines.
As far as
quality goes, the DCD figures blow the Captain Action sets out of the water. I really wanted to love the new Captain Action (hey, I had several of the original sets as a youngster back in the late 60s), but the quality just isn't there. The costumes are made of cheap fabric, with silk-screened details, and don't fit the CA figure very well. Most of the accessories are sub-par: the boots for Captain America have a sticky/tacky feel to them, the belt won't stay on, and the mask and head are over-sized. The shield is pretty nice, but the gloved hands are quite under-sized. And the range of motion in the CA hands aren't any better than with the DCD figures. OK, no cut joints with CA, so I guess that's a point in their favor!
I get the "kitsch" appeal of the CA line, and they do evoke a nostalgic feeling for me, since I had the originals, but in no way do they look better on a shelf than the DCD 13" line. I can't see them appealing to the action figure collector of today, spoiled as they are by Hot Toys offerings. As far as price goes, they aren't that much less than what I paid for the majority of my DCD 13" figures: if you factor in the cost of a base CA figure, you'll pay $50-70 for a figure and costume set, depending on whether you get the standard or deluxe versions. I got most of my DCD figures for less than $70.
Even though I was disappointed with Spider-Man and Captain America, I may get some of the forthcoming CA sets, particularly Iron Man and Thor, since I always wanted them to do those 2 characters back in the 60s. I find it amusing that they used the DCD 13" Classic Batman to do a mock-up with; there's no way the final CA product will look that good. I'm glad you're satisfied with them, but I find them lacking, at least thus far.