Quote Originally Posted by CloudDragon
The only relations Xenosaga has with Xenogears are minor such as the Zohar existing in both universes. In reality, the world of Xenosaga and Xenogears are not the same and Xenogears is not Episode 5 of the Xenosaga series.
Xenogears is Episode Five of Six of the Xenogears series!

(The other five just never got made.)

In any case, Xenosaga has potential but it's difficult for me to give it a true rating without playing an entire story arc. And as for it's relation to Xenogears (SPOILER)It does take place in the year that Perfect Works says the Eldridge was launched with Deus, so I'd be surprised if there's no link.