[KuroReishin]

Definitely worth watching. But be careful. Try watching the newer series before trying something older. I watched Wing first before watching another series. SEED is well...decent. SEED Destiny.....as many people mentioned earlier, SUCKED. 00 is better in terms of graphic, and showed some relations with the latest issues like energy crisis and terrorism. But, it began to stray from reality in the 2nd season. 8th MS Team was so damn realistic. No overpowered suits, no crybaby protagonist, just pure action. G Gundam is waaay to unrealistic. It is more like 'Super robots' genre rather than 'Real Robots'. And, if you like Wing, you'll probably gonna like the original MSG and all it's descendants.

Side notes: Don't just be a fanboy worshiping some bishie characters and godly overpowered suits. Take a look at it's storyline and storyline.