Do these comments by Stevens at least create the appearance that he can't be impartial in death penalty cases? Shouldn't he recuse himself?

JUSTICE STEVENS CRITICIZES DEATH PENALTY
Supreme Court Justice John Paul Stevens issued an unusually stinging criticism of capital punishment Saturday evening, telling lawyers that he was disturbed by "serious flaws."

Stevens stopped short of calling for an end to the death penalty, but he said there are many problems in the way it is used.

Recent exonerations of death row inmates through scientific evidence are significant, he told the American Bar Association, "not only because of its relevance to the debate about the wisdom of continuing to administer capital punishment, but also because it indicates that there must be serious flaws in our administration of criminal justice."

Other Supreme Court justices, including Sandra Day O'Connor and Ruth Bader Ginsburg, have also spoken out about concerns that defendants in murder cases are not adequately represented at trial.