I'll admit to being a Yank who likely has never seen a proper Irish pub in his life, and therefore can't give good advice. But it seems to me that Skarpi is not so much asking "what things do you find in a good pub?" as asking "how do you go about creating a good pub?"
If you in-the-know folks wanted to try and build a new pub, what would you do to ensure that it became known as a good Irish pub? Any advice on the trappings (chairs vs. stools vs. booths, preferred lighting, is a pool table required, etc.), the food & drink offerings (how elegant, how expensive, what's the minimum # of beers that should be on tap, etc), attitude of the staff, any efforts to attract particular entertainment and/or clientele, etc.
Certainly a lot of what makes a good pub special is the community of people - and that may be different in various other parts of the world. Hard to define, even harder to create. But surely all the collected wit and wisdom of 'Catters could come up with a few specific suggestions for Skarpi?