Ireland is just being used as a proxy here, imho. This is really aimed at the EU which is generally a high tax area. Corporations probably wouldn't dare to insult the EU directly but it's OK, apparently, to diss Ireland now that it's been brought low by corruption and incompetence. Given its history, location out on the fringes of mainland Europe and the strength of lack of it of the Irish economy, attractive rates of corporation tax are probably one of the few USPs Ireland has to attract jobs and business. So it's probably a good idea to keep these tax rates low but that is, or should be, the sovereign decision of the Irish people and what they decide we should respect. It's worth pointing out that of the corporations doing the complaining, two are utterly discredited and owe their continued existence to public funding (the banks) and three are gross monopolies. Complaints from outfits like these that poor people should become poorer so that rich people elsewhere can become richer are pretty darn sickening. If the Irish people decided to send these fellows home in a rowing boat, one couldn't blame them.
However, the larger question here is whether the EU/IMF bailout of Ireland will be sensitive and sympathetic. If the rulers of the EU (i.e., France and Germany) use the exercise as an excuse to strip Ireland of the few advantages it has, such as the option of offering low rates of corporate taxes, claiming "harmonisation" but with the real aim of luring these companies elsewhere then the "rescue" will really amount to a rape. These days you don't need to strip factories and ship them home, you just need to shuffle the foreign bank accounts and trusts around. Given the arrogance and clumsiness of those who run the EU, it would be prudent not to be too confident.