There were a lot of changes in S3 that made him meh instead of awesome like in S2. Due to resistance and armor changes, his shield is amazing anymore. On top of that, he used to be an AoE fast camp clearing champ but they made changes to the jungle and it slowed him down a bit. Then you mix in the tons of blinks and flashes in the game now and it becomes more difficult to land that ult against a good team. You probably won't miss if you're in a low elo bracket where nobody has the reaction time to dodge his ult, but higher up people will save their blinks for it if they have to.
I think it was Jatt who was saying Skarner will probably need Ghost to be successful like what we see with Voli and Nasus getting in there and skipping over the wards since he has a minor speed buff to abuse it with. Also, all three spirit items are solid on him though I prefer Ancient Golem to keep him tanky.
You like it or you don't, but i hate people saying it's 'an acquired taste." That's just a cop out. - bookwormbabe29 on beer.