I mean, pretty much every brand has a mixture of brilliant and not-so-brilliant products. I've tried some truly terrible products from the likes of Carpro and Gyeon, balanced by some brilliant class leaders elsewhere in the range. The sad thing about Meguiar's is that they should be an industry leader and innovator, but are stuck in 1999 selling old products to those not willing to try anything different.
Of the Meguiar's products, I'd say Hybrid Ceramic Detailer, Hyper Wash, Hyper Dressing and the Quick Interior Detailer (the retail version only, the Detailer gallon size has an unpleasant white vinegar odor) are their leaders. All have earnt a place in my cabinets.