Yes, the actual gundams usually look very similar. Though I can tell the differences no problem. It's sorta like once you find a good design, stick with it. Same thing with Macross's VF-1 series, though with more variation. It would just be nice if a toy company would release some of the other designs like the VF-5000 and VF-4.
I'd bet that if there were as many Macross TV series as there are Gundam TV series, you'd get just as bored with the designs for each show.
I agree that it doesn't make sense for there to be small quantities of new mecha every week, though since I don't watch the non UC timeline shows, I don't know what's been happening with those. I don't think the way things are presented in the UC stuff up through Char's Counterattack was too bad, except for the end of Zeta and all of ZZ. Usually (not always) new mecha came from newtpe labrotories trying to create a bigger/better newtype weapon.
Sarcasm here... Sure Macross is more realistic for a Millitary show if you count a Millitary of billions of space aliens invading the earth sphere, being defeated by a few thousand ships, and a young girls singing.