Well we were definitely held back economically because Dev clung on to power for so long!
However, I believe that if Fine Gael (under whatever name) had been the major party of power throughout our history as an independent state, they would have morphed over time into being every bit as corrupt as their devotees claim their major opponents are! Also there is no evidence to suggest that we would not have been a Theocratic state in all but name for much of that time! I think our SW system would not be as generous! I think militant Republicans would have been treated even worse!
If you believe otherwise, please provide evidence!