Rooney is nowhere near the top strikers/forwards of all time. His bottom level has been shocking for a world class player (which he was for 2-3 years, 09-11, but had a shockingly bad second half of the year in 2010) and his peak level wasn't that special either.
Because of his longevity he's had a better career than RVP or Drogba or some other top forwards of the last decades but RVP had a higher peak level than Rooney and the same holds for most elite forwards of the modern era.
Only people who haven't watched the best forwards from Van Basten onwards would suggest that peak Rooney was as good or better than peak Baggio, Romario, Stoichkov, G. Weah, Batistuta, Rivaldo, Shevchenko, Henry, Eto'o, Suarez, Zlatan, Aguero, not to mention L. Ronaldo, C. Ronaldo, Ronaldinho and Messi. Peak Robben was a (much) better player than Rooney too (but for a short period due to injury problerms). And peak Rooney wasn't any better than other class forwards like Villa at his best or Thomas Müller or Totti or Del Piero or Drogba or RVN or Lewandowski, etc.
Rooney's best seasons aren't really better than the best seasons of generally lesser players like Forlan or D. Costa in Spain. Costa's best season with Atleti was better than any season that Rooney had with United: won the title with Atleti vs superb teams of Barca and Real while scoring about as many league goals as Ronaldo and Messi, reached the CL final, etc.