I like O'Brien quite a bit. His partnership with Cunningham was excellent IMO. I'd be interested to see how himself and Dunne could get on together for a prolonged period of time. However, I don't see the problem in trying a few other pairings. I wouldn't be too keen on O'Dea unless he starts playing regular football and though I haven't seen St Ledger I've heard good things about him. It's unfair to judge him on the fact that his team are doing badly; it's not a great indication as to how good he is. You could use that point to argue that Given is a useless goalkeeper due to him conceding so many goals in the last 10 years.
I can't remember how many games they've played, but one good thing to come out of the Staunton regime IMO was that a defence of Finnan-McShane-Dunne-O'Shea conceded no goals (it was only about 3 games though) and never really looked like conceding and Dunne-McShane looked a potentially good future partnership in the games they played. McShane is still young and in his first season in the top flight so I wouldn't write him off just yet.
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