It is toy-like, but like stated above, a bit of mud and a grime will do it good. Those are the easiest weathering techniques, and I use them quite a bit. I'm not great at them but if it's not too hard on 1/32, it's can't be much harder on such a large scale. I mean, yeah, some things just because of pure size, but I've done my MiG up and it looks great so far. It just takes so long to do an entire 1/18 piece compared to a 1/32 piece. Especially aircraft. Armor is a bit easier.
But, give it a blackish-brown wash to bring out the panel lines and wait for that to dry, and then give it a brushing of mud. Then, if you wanna make it look even older, chip the edges with a primer/metal color. I'm definately not an expert but I am pelased with what I've done before and it takes a good 30 minutes to an hour for a quick job.
I'm sure with some TLC and some mods these could be nice pieces. Although I agree that they could do better out of the box. I think what FOV should focus on is new things, like said before. Goind where others have gone before is safe, but it's not going to net you the huge profit of going after something like a Stug or a T-34 that everyone wants in this scale, and has never been done. They need to read this site.
Sorry for the long post. I missed the forum for too long, haha.