Not correct to say he hasn't won a trophy. He won domestic honours in both Sweden and Denmark, including both league and title. Granted these honours aren't highly regarded, but to say he hasn't won anything is just plain incorrect.
It's relative though. He had a very talented core of Liverpool youth players (mentioned above) and was given a shit load of money to spend. Based on both of those facts, he should have won a lot, lot more honours. He was the weak link rather than the squad.
He is such an easily dislikeable man that I am glad he has (apparently) been fired. Liverpool should have won the title at least once over the last few years given the talent they had in their squad and the amount of money spent adding new players. The reason? Benitez couldn't man manage and was...