You could easily get the wrong impression of Dublin by concentrating your drinking in the wrong places! Temple Bar in general is to be avoided for lots of reasons but there are fantastic bars and pubs in the city.
If you want the authentic pub experience in the city centre, check out Neary's in Chatham Street, McDaid's just off Grafton Street or John Mulligan's in Poolbeg Street. Proper pubs with good pints.
The Smithfield area is full of great pubs: for traditional Irish music (proper sessions) try the Cobblestone or Hughes's where there is trad every night. Also in that area, Walsh's in Stoneybatter is a great pub with a traditional bar and lounge and a great pint of Guinness. Smithfield is easily reached from the centre via the Luas or short taxi ride (€6 or so).
Staying in Smithfield, Ryan's in Queen Street is a strange little pub with an interesting and eclectic crowd on weekend evenings. Across the road is the Dice Bar, a cool spot which plays very very loud funky music if you're in the mood.
Another funky bar with great music and good-looking punters is the South William in South William St. Also along those lines is Solas or The Village in Wexford St. Across the road is more grungy Anseo, a great friendly little place with DJs every night. Check out also the George Bernard Shaw, just up the road in South Richmond Street.
For clubbing, the Pod in Harcourt Street is still going strong and you could also check out the Twisted Pepper down on Abbey Street.
Unless you want to drink an awful pint of Guinness for which you will pay through the nose while listening to a very contrived music session, don't go to the Oliver St. John Gogarty in Temple Bar. The fact that no Irish people do should tell you all you need to know. There's nothing traditional or authentic about most places in that area but that doesn't stop them being packed to the rafters so it all depends what you're after.
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