I think Baghdatis gets a bum rap. He won a title in 2006, made the Wimbledon semi's and cracked the top 10. That's not that bad. Gonzo on the other hand completely imploded.
Yeah I dont get why people consider Marcos a failure. His performance in Slams in 2006 wasnt bad at all and he reached the top 10.
Gonzalez is a different story, he had been a solid top 20 player for a while who had a hot streak and played above himself for a few months. Tsonga has been rising for the past year and hasn't shown any signs of stagnating.