@coorta88 and @Barghum: Thanks for the feedback, I'll add some more lore at least to clear things up.
Are there any plan regarding somewhat comical looking X-com tanks (they basically look somewhat similar to children toys) ? Would it not be possible for X-com tanks to look like MAGMA tanks ?
I don't think they look like toys, they are in line with X-Com graphics in general. If anything, M.A.G.M.A. tanks are pushing it, they're a bit too blocky compared to most things in the game.
Anyway, I don't foresee replacing X-Com tanks with anything, since other designs (like M.A.G.M.A.) does not allow for rotating turret - positioning issues.
EDIT: made another mission with Jarheads.