Looks like they did the same thing that BotCon did and gave Thundercracker a 'medium' blue. Not as light as the cartoon, but not as dark as the original G1 toy and Marvel comics. So it's like a compromise to appease both groups of fans, which I think works well.
+1
I already have Gentei Thundercracker, but I'll pick up a RtS Thundercracker too.Scourge's wings look a bit weird -- but that's just my G1 fanboy bias kicking in. Objectively speaking Scourge's alt mode looks a lot better than G1 Scourge's since it's clearly meant to be a bomber jet (whereas G1 Scourge's alt mode seriously looks like a boat! :P)