How would you rate these three piano concertos in difficulty?

[sv3nno]

(I don't want to hear any of this "it's pointless because it's subjective" crap. I know it's subjective - i'm just interested in people's opinions!)

Grieg a minor
Shostakovich no. 1
Shostakovich no. 2
Gershwin Rhap in blue (technically not a concerto, but still.)

Easiest-hardest? Interested in seeing what you think!

[visitor]

on a scale of 1 to 5 , 1 being less difficult, 5 most difficult

Grieg - 3.5
Shosty 1 - 3.5
Shosty 2 - 3.5
Gershiwn rhap - 3.5

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that's my opinion, i should know, i'm an expert in on my opinions

[j_menz]

on a scale of 1 to 5 , 1 being less difficult, 5 most difficult

Grieg - 3.5
Shosty 1 - 3.5
Shosty 2 - 3.5
Gershiwn rhap - 3.5

\
that's my opinion, i should know, i'm an expert in on my opinions

Ridiculous. The Shosty 2 is clearly no more than a 3.4999978. 

[visitor]

Ridiculous. The Shosty 2 is clearly no more than a 3.4999978. 

i think you may be write, i was not using proper significant figures!!!
https://www.usca.edu/chemistry/genchem/sigfig.htm

[sv3nno]

On a second thought, I think I should've not asked this question :s

[goldentone]

on a scale of 1 to 5 , 1 being less difficult, 5 most difficult

Grieg - 3.5
Shosty 1 - 3.5
Shosty 2 - 3.5
Gershiwn rhap - 3.5

They're all the same difficulty according to your grading list.  That seems unlikely.  But, I will take a 3.5 over a 5, except maybe if bent over exhausted working on two in a day.