It's not a matter of what camera model or how basic or sophisticated the camera's metering is even though where and how a camera meters does have significant impact on the resulting files.
It has to do with exposure values and a capturing device's dynamic range - how much bright and dark you can capture without either highlights or shadows go completely white or black.
The samples you provided also look like they were shot on dull, overcast days. Barring atmospheric factors, they could probably be improved in post if you shot in RAW.
Read up more on the BASICS of light, exposure and digital cameras if you haven't already done so.
