Not very good.
The first thing that annoyed me straight off was the shameless butchering of a quote from the original Command and Conquer : "He who commands the past, controls the future; He who controls the future, conquers the past"
If you're going to steal lines, at least make sure they're accurate.
Past that, the game concept wasn't horrible. This isn't, exactly, a match-up I would have considered, but lets get to the problems. The controls were clumsy at best, and the units lacked any sort of basic intelligence. The music and sound were somewhat fitting, though it got irritating after awhile as it didn't have much variation.
From a flash standpoint, it was good (thus the 3, not the 0), but I don't believe it was even mediocre in terms of playability.