An all-time survey conducted by
Physics World.
http://news.bbc.co.uk/2/hi/science/nature/541840.stm
01. Albert Einstein
02. Isaac Newton
03. James Clerk Maxwell
04. Niels Bohr
05. Werner Heisenberg
06. Galileo Galilei
07. Richard Feynman
08. Paul Dirac (tie)
08. Erwin Schrödinger (tie)
10. Ernest Rutherford
I disagree strongly with it.
Of course, I'm not remotely in any position to criticize but I think it's nonsense and find "guys like Bohr" relatively overrated. His most significant contribution was a theoretical model of how electrons (discovered by JJ Thomson) orbit a positively charged nucleus (discovered by Ernest Rutherford) based on Max Planck's quantum theory of radiation (the origin) and was rendered obsolete within less than a decade. All of the aforementioned remain fundamental.
There were two different iterations of quantum mechanics when it was established: matrix mechanics (Werner Heisenberg) and wave mechanics (Erwin Schrödinger). The QM used today predominantly utilizes the wavefunction in the latter's equation to describe fundamental forces and subatomic particles and is considered the F=ma of quantum mechanics. Heisenberg has actually become better known for the contribution of the Uncertainty Principle.
It was Paul Dirac that showed matrix and wave mechanics to be mathematically equivalent although he's much better known for reconciling quantum mechanics with special relativity which predicted the existence of antimatter, was the first step towards the advent of Quantum Field Theory and thus, ultimately the Standard Model.
I'd probably have it something along these lines if you're going to try and "rate" physicists.
01. Sir Isaac Newton
02. Albert Einstein
03. James Clerk Maxwell
04. Michael Faraday
05. Erwin Schrödinger
06. Werner Heisenberg
07. Paul Dirac
08. Ernest Rutherford
09. JJ Thomson
10. Max Planck