[Sentenza]

Obviusly Gundam IS worth watching.

I think it's better to watch it in a chronological order :
Starting with the Universal Century.
- MS Igloo
- Mobile Suit Gundam 0079
- Mobile Suit The 08th MS Team
- Mobile Suit Gundam 0080
- Mobile Suit Gundam 0083
- Mobile Suit Zeta Gundam
- Mobile Suit Gundam Zeta Zeta
- Char's Counterattack
And then if you want you can watch also
- Mobile Suit Gundam F91
- Mobile Suit Victory Gundam
- Mobile Suit G-Saviou
but they are not related to the UC storywise

then i'll watch
- Mobile Suit Gundam Seed
- Mobile Suit Gundam Seed Destiny
- Mobile Suit Gundam Seed Destiny Final Plus
- Mobile Suit Gundam SEED C.E. 73 Stargazer

And if you have time to spare watch the other series OO wing etc. they are not linked in any way with the other series so you can watch them without worries even before watching the others.