For me, Lacazette is at least as good a striker as Kane and Lukaku - he'll get as many as them next season, probably more.
The fact that I'm not jumping for joy at signing Lacazette is in line with what I think about the quality of those two, the quality of the Premier League in general and the fact that I'm still not over us having Henry, Bergkamp, Wright up front for us once upon a time. Mbappé belongs in that company, Lacazette, and indeed Kane and Lukaku, do not.