Actually I was surprised by Shamrocks. I have put off trying it for awhile just because I typically don't do fast food and it felt like a fast food restaurant.
The burger was tasty. Thinner then expected but with the traditional options I was able to make a messy burger just the way I like it. And I would eat it again. A good measure. The Philly cheese steak was good, however I was curious on where the cheese was. More would have made it more traditional. And would have mitigated the question - where is my cheese?
The homemade fries were amazing and I ate those up quicker then you could say my name.
The onion rings need some help. The batter tasted like something that you would expect on fish. Same texture and taste. And not necessarily a bad thing. However, it would be fine if the onions were cut to the size to appropriate for the batter. I say this because the onion rings tasted like batter versus onion rings. Unless the onions are cut wider I would avoid them, which is unfortunate because they are almost there.
Overall, try it. Find what you like and enjoy!