You do not want to sit anywhere on the "occulus" end of the arena for hockey. The other areas of the Barclays Center actually afford quite good site lines for hockey... But seats down on the 4th avenue end of the arena? No way.
That being written, the Isles were not going to enter into any type of agreement to continue playing a Nassau Colosseum. Barclays or Izod were their only alternatives w/o leaving the market.