OP isn't using raw guys, read the initial post again more carefully.
I'm willing to bet the issue is simply one of settings - most likely too high ISO. OP is probably using some Auto mode and expecting miracles - these cameras really only shine when shooting Manual and knowing what you are doing.
Noisy_Parker can you relate all the settings that you are using - ISO, shutter speed, f/stop, picture profile and any others that you know? Have you tried shooting without Magic Lantern to compare? If we can nail down exactly what the issue is then we can give tips to fix it, but there really isn't much to go on in your posts.
I'm willing to bet the issue is simply one of settings - most likely too high ISO. OP is probably using some Auto mode and expecting miracles - these cameras really only shine when shooting Manual and knowing what you are doing.
Noisy_Parker can you relate all the settings that you are using - ISO, shutter speed, f/stop, picture profile and any others that you know? Have you tried shooting without Magic Lantern to compare? If we can nail down exactly what the issue is then we can give tips to fix it, but there really isn't much to go on in your posts.