I think an upsized Gunship is a to-scale Gunship... Which I'd like because the turrets look comical ont he current one IMO, but I love them so (just found them tonight).
The "toy like" aspect is a really person-to-person thing... For me, the AT-TE is pretty well perfect. The X-Wing is not. The TIE Interceptor/Fighter/Bomber is. The Juggernaught is not. And so on. For me though it has a lot to do with what's to-scale or falls within the leeway I'm willing to give (because scale often varies slightly with SW stuff). The upcoming AT-ST falls into the hell yeah category, but current Snowspeeders don't.
Sometimes that's usually all it takes. The X-Wing is good though in that it's a great toy I think for the most part, and it's very realistic looking, it's just far too underscaled to suit me.
That same thing can be said for the Gunship, ARC-170, and so on.
The Turbo Tank I feel isn't as good as those though... It looks a little realistic, but not as nice as the above. It's a bit more, to me, toyish looking. Not horribly so, but enough I really feel it just looks off a bit. Definitely off from what it's intended to be, and obviously nowhere near to-scale.
The same would be said for a new AT-AT because there's no way they're doing a 50" tall AT-AT. I gave the BMF a pass because I got it on uber discount and, hey, it's the Falcon.
I think the Twilight would be a great addition to the bigger vehicle line-up though, and if they delivered something real spiffy I may cave, but for $100 I really don't think they'd pull something off I was totally happy with.
I heard a funny story about "big vehicles" not too long ago. It was interesting actually because it entailed a lot of "what they want, and what can be done" discussion. I wish there was a series of "1:18 (Star Wars isn't exactly this scale though)" vehicles that were done as a collector's series. It'll never happen, but it's one of the few things I'd pay through the nose if it came to be in some alternate universe. In the end, doing them yourself is ultimately the only answer for a lot (most) stuff.
A weird story that sort of goes a little with this discussion though, the 1:18 military lines I'm into are going to do pieces of flight deck from aircraft carriers, to display modern jets on, as well as flight crews, pilots, and vehicles for support of the planes. Pretty crazy stuff, in terms of scale because 1:18 modern jets are pretty massive. Much larger than a lot of scale Star Wars fighters and things, actually.