Being a space enthusiast, I'm delighted with the mission. It won't benefit me personally but I think it's worth doing for the sake of knowledge.
I'd like to see more robotic missions even if that means fewer manned missions. We learn a lot more by sending robots to the planets than we do by sending men to low earth orbit again and again.
The well-publicized "Mars jinx" is overrated. Only one of NASA's missions to Mars had a major failure. All others were by the Soviets and I think many of those were due to crapshoot mistakes that they could have avoided with better diligence.
Short link to NASA Phoenix website:
NASA - Phoenix