No matter how complex a kit Bandai puts out, it's still an unassembled toy. It's just overwhelming because of the sheer number of parts. If you put three or four 1/144 kits together in one sitting, you've put together the equivalent of a MG kit. By extension, putting three or four MG kits together in one sitting would be comparable to putting together a PG kit.
It does not require skills to build Bandai kits. Just patience.
Since kids think that building a Bandai kit is modelling, they moan and groan when they have to paint a real model kit. In their mind, "if Bandai can pull it off, why not Hasegawa or Tamiya?", when clearly, we know that between Bandai, Tamiya, and Hasegawa, Bandai is not the one putting out superior models.
The one thing I can give Bandai, though, is vastly superior injection molding technology. Their ejector pin marks are hardly detectable. The ones that can be found have been thoughtfully placed *away* from molded details. Can't say the same for Hasegawa.