Gary Oldman for years has been the guy you look at and think "Hey that guy's really damn good," and then just forget about him until the next time. He's been a Harry Potter, a punk rocker, a drug kingpin, a space guy, and everything in between. Now he's in a fat suit and we're supposed to be impressed. Spoiler alert, I was impressed.
In case he comes out as some kind of evil bastard with sex problems or is an armoured car robber, I must say I know next to nothing of him as a man. You know what, more actors should become awesome thieves. Not like when people shoplift and claim it's an acting thing, but more like that Kevin Bacon commercial when nobody can believe it's him. If Ray Liotta came in with a gun to the library and said, "Gimme the cash drawer," I'd be telling the cops "Some guy looking like Ray Liotta robbed me" instead of "Ray Liotta robbed me."
If you want a movie in between King's Speech and Dunkirk that has some heart, see this flick. It's more about the acting than the story. I'm not sure how accurate it is, but everything goes for broke and does well. Worth a matinee for some of the good shots or a rental if people keep talking about it for awards.