At least they are sticking to the rules, even with loopholes and a low tax rate, in Ireland. Greece has much bigger problems.
Greece has both loopholes (for ship owners / shipping companies, think Onassis) and corrupt tax collectors, but their biggest [OT] problem is the corrupt government that managed to greatly increase the interest on the country's dept so the banks could earn more - on purpose, I'm sure (good reading: famous composer and author Theodorakis about this => http://theodorakisfriends.com/news/the-truth-about-greece/).
Mildly put ... Some people might say it contributed to the problems the Irish economy has at the moment and also to those of the rest of the EU, which has to compete with the low taxation and loopholes the Irish tax code offers.