Well, i don't really rate Icardi, but apparently he's a pretty good striker if you provide him with proper service, Dzeko wasn't too bad with City either (Goal per minute wise) if i remember correctly? and Roma play attacking football that suits him. Belotti might end up as the next big thing or as one hit wonder, hard to judge at this point.
I don't see what's the problem with Higuain though, he simply is a great striker (except for Finals...)
But overall i fully agree with "the standards have fallen".