While the film is exactly as silly as Olympus Has Fallen...it admittedly has a lot more fun with the cheeseball, post-9/11 patriotism that underlies the lark. That's the real saving grace for a film that is essentially a carbon of a carbon of a carbon.
Emmerich has a bigger budget to play with than Olympus Has Fallen director Antoine Fuqua yet fails to get more bangs for his bucks or outdo his predecessor's guilty-pleasure thrills. With Olympus it was the effects that were cheesy; here it's the script.
Whether or not you enjoy this film depends entirely on whether you judge it to be po-faced or parody. If you believe it's the former, you'll probably hate it. If you believe it's the latter, you'll have an absolute blast.