When Alexis is on a scoring streak, he is absolutely a top forward. At Barca, he was quite streaky, which included too many overly long non-scoring periods. He also had very, very good periods at Barca, particularly playing at home. Was he the best fit at Barca, playing with Neymar and Messi? No, all were too small, none were target men, Alexis is not at his best over in the right corner. The Trident fit together perfectly, Alexis is much better off at Arsenal. Good move for all.
Alexis is one of those players who looks a lot better live than he does on TV, even when he is not at his best offensively. His defense might be the best in the world at his position, seeing the effort he puts out is inspiring.