I don't think Todd Helton gets his proper recognition. People discount him because they think he is just a product of Coors Field. I don't argue that Helton didn't post some awesome numbers at his home field but the same can be said of many many Hall of Famers.
Consider this, however, George Brett had a career OPS of .857 while Todd Helton has a career road OPS of .873. The stat of OPS+ is supposed to take into account park factors and when a player spent his career. This leveling stat has Brett at an OPS+ of 135 while Helton is at 137.