Hi Andy,
I think that it's more a case of East Cabra (the Phibsborough side) being better than West Cabra. I know of some people who had problems on St. Attracta Road due to annoying younger residents throwing stones at their window, but it always seemed okay to me anytime I was in the area. It's definitely not all bad. It's convenient and the houses are very sound, being ex-corporation. South of Fassaugh Avenue and the roads close to New Cabra Road are very good and I can recommend this part of Cabra as one of the few parts of Dublin where you can get a half decent house for less than 400,000 euro. If you can stretch to this part of Cabra, then I think you'll find yourself in a nicer area.
Good luck,
Budapest