Egy jó angolos átnézné nekem a következő mondatok helyességét?

I would appreciate a positive feedback and the same will be returned to you.

This is a community market and we all try to do our best to satisfy your needs and expectations.

If you are not happy with the service or a product, I would appreciate it if you would contact me first before leaving a negative feedback.

Please don't post your complaint on Ebay as this would affect my reputation.

Please email me and together we will come to a mutually satisfactory resolution.