If it's got a 2000 sq ft footprint, with one story above ground and one below, that fits your description, but I don't think most McMansions tend to be one story—if they're 4000 sq ft, I would guess that many are likely to have about a 2-3000 sq foot footprint, with part or all of it having a second story (actually, rarely all, because a full-height foyer is a fairly common feature, from what I've seen).
I obviously can't comment on what you've seen derided as "McMansions", but I've seen a bunch of the stuff on McMansion Hell specifically (the blog the author of TFA maintains), and in general I wouldn't say they fit what you describe. Or, at least, some of them may not have a much larger livable square footage than a rural/suburban middle-class house, but they certainly cost appreciably more, because that middle-class house is built in a more or less standard manner, and the McMansion has a three-stall garage, four separate sets of pillared porches on the front, and three bay windows (in three completely different styles).
McMansions are a very specific thing that "you know when you see" - and they are in no way "all houses currently being built".
Go here: https://www.wausauhomes.com/search?& and play around, you don't really start seeing things I'd definitely call "McMansion" until you're in the 4+ bedroom category, and many of the 3+ are quite nice looking.
(I personally get much more annoyed by "attached/built in garage" because I know what that can do to the mechanical envelope of a house.)
If it's got a 2000 sq ft footprint, with one story above ground and one below, that fits your description, but I don't think most McMansions tend to be one story—if they're 4000 sq ft, I would guess that many are likely to have about a 2-3000 sq foot footprint, with part or all of it having a second story (actually, rarely all, because a full-height foyer is a fairly common feature, from what I've seen).
I obviously can't comment on what you've seen derided as "McMansions", but I've seen a bunch of the stuff on McMansion Hell specifically (the blog the author of TFA maintains), and in general I wouldn't say they fit what you describe. Or, at least, some of them may not have a much larger livable square footage than a rural/suburban middle-class house, but they certainly cost appreciably more, because that middle-class house is built in a more or less standard manner, and the McMansion has a three-stall garage, four separate sets of pillared porches on the front, and three bay windows (in three completely different styles).