Allardyce wouldn't be an appointment that would excite or suggest a long term strategy. However, I think he's a very good manager and is treated unbelievably harshly.
He has done excellent rescue and improve jobs over and over again. His England departure was a nonsense. He'd be great for our younger players, educating them on how to defend and how to manage games.
There is also a good chance that he'd bring back Shakespeare and Walsh which would not be a bad thing. All in all, he is another that I'd much prefer to the present incumbent. I'd bet on us getting quite a few more points over a season with him than Puel.