My first thoughts were also why Neeson (not Nielsen), he's a serious actor. But yeah I can see the idea of them wanting him to play it straight, in the ridiculous scenario.
Speaking of serious, or maybe it was seriously dark comedy, I remember Leslie Nielsen playing a killer on the film Fright night. Ted Danson was having an affair with his wife, so he got them both, and buried them in the sand, up to their necks. And he filmed them both and laughed, as the sea came in and drowned them. As you do!. But...
Leslie Nielsen was a master of the deadpan. I am not sure anyone could have acted in Police Squad, Airplane and Naked Gun better than him. Comedy genius
On about remakes, reboots or whatever you want to call them, don't bother watching War Of The Worlds on Amazon Prime starring Ice Cube and Eva Longoria. Biggest pile of shíte I've ever seen. 91 minutes of my life I'll never get back. Makes Battlefield Earth look like a masterpiece.
Christ it must be bad then, cos Battlefield Earth was the biggest pile of poo I've had the misfortune to watch (and I've watched some reyt shìte)