Dublin may have its problems but it is miles ahead over Manchester in terms of passenger experience.
Only your opinion as a regular MAN moaner. bayer328 and All Names Taken would seem to disagree with you about DUB.
Following the slump after 2006, MAN took longer than some airports to recover, so I can understand some reticence in committing to infrastructure investment too soon. However, from an outsider perspective it could be thought that action is maybe a couple of years late and I can understand why some feel the 10 year time frame for the TP is too long.
That said, my own experiences at MAN in recent years have not been at all bad.