The length of pull is generous to the point of being a problem for some people. The Tupperware stock is very light, and as a result you might find recoil objectionable. Also, the factory recoil pad is on the hard side and does not cushion recoil as well as it might.
The bolt and carrier are not finished anywhere near as nicely as the 500/590 guns, so the action will take lots of work before is slicks up. This is potentially a more serious problem than it may appear on the surface, as it could result in short stroking the action when you really need that back up shot.
If shooting slugs is going to be an important role for this gun, the bead is all but useless, because it is mounted right on the barrel without a pedestal to bring it up to the height of the receiver, so you will shoot high. The safety is a cross bolt rather than Mossberg's ergonomic tang safety.
One serious disadvantage of the 500 series which is also true of the Maverick is that the magazine cannot be stripped for cleaning. For a gun that is likely to be out in the weather, I consider this a major flaw in design. I am pleased that it was not passed on to the 590 models, or there would be an 870 on my rack instead.
The bottom line is that as with all things, quality has a price. Anything can be made poorly for a cheaper price, it all depends on what level of quality you are prepared to live with.