As Ryo Chan says, SEED is a separate universe from Wing so you don't need to watch anything else before giving it a try.
I certainly enjoyed SEED, it's not the best Gundam series I've seen but it's much more accessible than some of the older stuff (I started on Gundam with SEED, you see). Some of the action is great fun and it's all decently animated (not as good as 00 but then it's a few years older), although as hopeful_monster points out there is some use of stock footage (and plot armour). The story's relatively simple but generally well-paced (a few things are never quite properly explained, though). The mechanical design work is pretty good, the mecha come with lots of dongles and stuff but are generally cool and I personally think that the Strike is a particularly well-done design.
Opinion on the sequel, SEED Destiny, is divided. Some (myself included) think that it was a step down in quality, but that's another argument.