This is a review of the Region 2, 2007 edition of the DVD "John Candy Collection", not the movies themselves.
"Uncle Buck" and "The Blues Brothers" are presented in decent anamorphic transfers.
"Going Berserk" is anamorphic but the picture's a bit grainy, and lip-synching is out in places but this could well be the original movie.
"Brewster's Millions" is non-anamorphic 4:3 full-frame, pan-and-scan. That means on a standard TV it fills the screen, whilst on a widescreen TV you get black bars left and right where the rest of the picture should be. To be fair to the publishers here, the back of the collection box is correctly labelled. At the time of writing, there's never been an anamorphic release of this movie outside Region 1 America so that's the version to go for if your equipment is multi-region / NTSC compatible. It's also available as part of the all-anamorphic Region 1 "Richard Pryor 4-Movie Collection".
Finally, "The Great Outdoors", and what a mess. The back of the collection box says "1.85:1 ANAMORPHIC WIDESCREEN". Wrong! The back of the individual disc case says "2.35:1 WIDESCREEN". Wrong again! It is in fact non-anamorphic 1.85:1 letterbox. That means on a standard TV you get black bars top and bottom. On a widescreen TV you get a thick black border, left, right, top and bottom, or zoom in for very low definition.
So, if you have a standard TV and have no intention of changing, you may consider this collection good value. For everyone else, perhaps get it for "Uncle Buck", "The Blues Brothers" and "Going Berserk" (ignoring the other two movies) if you think it's cheap enough.