[quote=Makatsume Haru]
So, how about I change it to the fact that it can't actually control Servants, but put them to sleep? And that'd be just for like, 3 mins. Do you think that'd tune it down good?
[/quote]

The problem is that it's 'use ability, with no conditions, obtain instant victory'.

[quote=Tatsua Aiisen]
The Gate is a portal to his treasury. The contents of his treasury are not his noble phantasms, they are simple magic items that happen to be on the level of noble phantasms.
[/quote]

Incorrect!

[quote=Complete Material]
Gate of Babylon
Rank: E~A++
Type: Anti-Personnel
Range: -

A key-like sword that connects to the “Golden Capital”. The spatial connection with the treasury allows for easy access to the items within. The rank changes to E~A++ because Gilgamesh put all the originals of Noble Phantasms into the treasury. In other words, E~A++ reflects the rank of the items in the treasury. If the treasury does not contain a wealth of valuables, then it will not be a useful Noble Phantasm. 
The favourite Noble Phantasm within the Gate of Babylon is the chain which has captured the Bull of Heaven – Enkidu. It is an anti-deity Noble Phantasm that increases in strength as the target’s Divinity increases. It was able to completely seal Herakles.[/quote]

They actually [i]are[/i] Noble Phantasms, from before they actually became the modern versions. Shirou spots the original of Gae Bolg at one point.

[quote=Hillbilly12]
So are we assuming any OC Magus family is younger than 200 years old before the third Holy Grail War? I would assume that since only three major families was involved in that war the others didn't exist, either that or the OC families just wasn't chosen for awhile.
[/quote]

Um... no? The three families were more or less all chosen because they were linked. The Tohsaka had the land, the Einzbern had the mechanism, and Zouken was around... I'm not sure but I think it was because he was associated with Zelretch somehow. And he made the Servant system and Command Seals.