There's good quality salmon and not so good just like champagne, wine etc. Make sure you get irish smoked salmon, this is drier and less salty than the scottish and scandanavian salmon which isn't up to par. This salmon served with a squirt of fresh lemon juice (or a cucumber greek yoghourt mix ) is really worth it.
By the way, I'm not at all irish so not promoting but just someone who has had experience over the years with dinner parties and everyone has been overwhelmed with irish smoked salmon..