The "splotchy-ness" problem is almost always due to using to thick of a coat, followed by improper removal. If you are a pro and waxing with a machine then it shouldn't be an issue, but when working by hand it is very easy to use too much product.
Most people think "if some is good, lots must be better!" but that just isn't true. (At least not in this case).
I too had issues when I first used it, but I have since perfected my technique and now I am able to wax and entire vehicle with M21 2.0 with less than an ounce, easily. Also, with Meguiar's waxes "the swipe test" is your friend. Learn, use it, live by it- LOVE it. It works.