Mario's is solid Portuguese chicken. Sometimes can be on the dry side, but overall good value and good flavours. The potatoes are the bomb, add some piri piri sauce to them and its a party in your mouth!
One time I had a poor experience with possible food poisoning which I attribute to the lady behind the counter using the same tongs for raw and cooked chicken. Which might have been an accident, because I have come here SEVERAL times and never had an issue before.