For certain games when you select 'force 4:3', it doesn't really force 4:3. In fact even if you force 16:9 they still won't fill out a 16:9 monitor. However you can manually stretch the window to sort-of get 4:3, which begs the question - why can't Dolphin automate this via some tickbox or per-game config? As it stands, certain games will always look unfaithful to the original version unless you play in windowed mode and fiddle with the window size.
I've attached some examples below from Resident Evil 3
Left is Dolphin's square-like result
Right is from the PC version with correct aspect ratio
I've attached some examples below from Resident Evil 3
Left is Dolphin's square-like result
Right is from the PC version with correct aspect ratio
Clevo P151HM1 | [color=#87CEEB]Core i7 2760QM @ 3.2GHz[/color] | [color=#32CD32]NVIDIA GTX 560M 1.5GB[/color] | 8GB 1600MHz RAM | [color=#4682B4]Windows 7 Ultimate[/color]