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Are Irish people really obsessed with potatoes, or is that just a legend?

Obsessed? No.

But you'll still find a lot of dishes with some form of potato.

I wouldn't say I'm obsessed, but I will say that I do like potatoes. The red ones are my favorite.

Potatoes are good, but you know that they originated in the Americas? The potatoe famine was mainly caused by most of the population of Ireland living on nothing but (or something like it) potatoes. And because the potatoes were bad, and the other foods weren't as popular and/or common, most people starved.
Not the best time for the Irish.

MMMH Potatoes..I didn't realise how much I eat them till we were away in Italy last year on our school tour, we were all dying of starvation our lunches were fine, pizza ya whatever but em the dinners were horrible, by this point now we were sick of cheese, or last day at the hotel out comes the waitors with trays of what looked like creamy mashed potatoes, by this point now like everyone was drooling so they put down the potatoes onto our playes, everyone takes a massive spoon of it and shooves it into our mouthes AND..there was cheese in the mashed potatoes..CHEESE.. stare stare , then came the tears.. crying crying everyone started skitting but in a depressed kind of way, Why God WHY. Why were you so cruel??..
and to anwser your question..yes Irish people like potatoes..ALOT..mmmh.

Ones with a bit of butter on them, or creamy mashed potatoes, oh and gravy oh mmmh. Now I'm hungry.

Id never heard that rumor, it might just have to do with it being their main carb and having a famine awhile back.

The fungus that affected the potatoes was not limited to Ireland, it ruined crops in British Isles and mainland Europe. Only in Ireland was it the only crop available to most people. Only in Ireland were people breaking the law if they tried to give other crops to starving people. The people of other countries, like France, just changed to other food.