Well, as a diehard TCW loyalist, I think the RC Hailfire does not compare very favorably with the AT-AT. The AT-AT is a marvelous vehicle with tons of cool features and add-ins that fans have been clamoring for. The Hailfire? Not so much.
I do give the marketing weasels credit for finding a way to wring $$ out of the non-RC enthusiasts by scaling it for the 3/4 line and throwing in a clone trooper. I'd never whiff this otherwise.
But if that's the best we (TCW fans) are getting this year, that is a big fat screw IMO.
It's too bad the Mandos didn't have a giant sized vehicle in their arc otherwise Hasbro would be falling all over themselves to get that on the shelves. 
TWILIGHT IN 2010!!!
I don't think your comparison between the RC Hailfire and the AT-AT is fair. The Hailfire cannot be classified as a "large" vehicle just as the AT-AT cannot be seen as a "medium" vehicle. They are at very different price points and it can be argued that they are targeted to different audiences.
As a diehard Clone Wars fan, you shouldn't feel pressured to purchase this because of the Clone Trooper. If you are indeed a "diehard loyalist" you already have the figure. And if you really like the Clone Wars, you should be ecstatic that Hasbro has finally made a vehicle in the animated style.
As for TCW fans getting screwed, I think that's far from the truth. If anything, this year is better that the last two. Not only will kids (and adult fans) have the nifty Hailfire Droid, but the new AT-AT will work great with some Clones and Jedi. Hasbro even had CW items surrounding the AT-AT at one of the European shows, and an ARF trooper could be seen in the NYTF pics.
The Twilight is a vehicle that
should not be made, or at least in the large vehicle assortment. First, the design is boring. It looks like a flying box. Second, the ship is barely in the TV show. When it is, it is not very memorable. The Twilight's only appearances in Season 2 were during the three episodes slotted for the first season. If the Lego model could be used as any indication, the ship did not make a popular toy.