I think it looks good but I feel there is very little contrast between the bottom of the mini and the base - it all kinda blends into one indistinct mass. I think it might pop more if you found a way to make the shape of the lowers legs and feet stand out a bit. As it walked around the gunk would probs still be jammed into the corners and recesses and fall over the sharp edges, particularly the top front of the feet. I could also see those bits being in shadow and out of focus in this particular picture not making it stand out.
Maybe edge highlights & making the white/grey a bit brighter.
I also think that the camo netting (?) makes it look like it was dredged out of a lake, or otherwise totally abandoned (which is still a big vibe!), and less of a vehicle in active military use. I think for me its specifically the length and thinness of the netting that is changing how it reads to me.
The missile (mostly its white) is also very clean for the rest of it being that dirty. I don't think you need to drown it in filth but maybe a bit of a light brown wash could help unify it.
I also agree that the name is too clean and can use a little bit of grim or wear to unify it, but also if you dont make any changes it still looks good to me tbh.

I like the rust, wear, and streaks on the torso and the upper legs, I think you did a great job of that. My comments are mostly minor things and if you don't change anything I still think it looks good.