I disagree with this, he's been alright at best. He isn't at the level of Lewandowski, Aguero, Benzema, Suarez, Neymar (let alone Messi/Ronaldo) etc and that's what we need to if are to break into the Madrid/Barcelona/Bayern group again. However we have much bigger priorities at the moment and having a great striker up front, rather than just a good one isn't a priority. Not only this but paying a good striker £250k a week to be a backup would be stupid.
Lets bear in mind his ratings on here as a striker these last 11 games have been: 7.1, 6.9, 6.6, 8.2, 5.3, 7.2, 6.7, 6, 4.1, 3.8, 5.2. An average rating of 6.1 and only scoring 5 is hardly "a breath of fresh air", particularly when our best team performances have fell during this period. He's also been awarded merely 2 man of the matches this season: one in midfield and one up front.
He isn't a consistently great striker, that much is clear.