It's currently the best exclusive on XBone/PS4 - accoring to metacritic (with 86 critic reviews), alongside Forza (currently with 76 critic reviews) - if we don't count Resogun. :-/
And when the average review is 4 out of 5 - after so many reviews - most people will call it a great game. :-/
Most natural game-comparison on PS4 in the same genre, is Asassins Creed:Black Flag - that got 83 in average, that's also a openworld game.
Much better graphics on Infamous, but much more content and much better music in AC, wich make AC a better game. :-/