[quote=@Earnest Evans]
<Snipped quote by Flamelord>

Oh yes, I'm sure being able to use [b]Excalibur[/b], one of the greatest Noble Phantams that turns anyone with magical abilities into a super-superhuman, [b]Rho Ais[/b], a shield that blocks damn near anything (including Noble Phantasms), [b]Caladbolg II[/b], a sword that completely penetrates any defenses and is a really good sword otherwise, [b]tied with a wide variety of useful magical skills[/b] doesn't make this character overpowered.

You've got a grab bag of ultraweapons, the ability to summon them almost at will, and the powers of an excellent Mage on top of that!
[/quote]

So wrong on count one, wrong on count two, wrong on count three, and a bunch of things that are less significant than characters who simply happen to have a wide variety of swords.

FFS, if limited to the first three we have:

1) Suicide attack (Projecting Excalibur is not feasible more than once. Literally. And it's only useful if you USE the thing)
2) Extremely exhausting shield against [i]ranged attacks[/i]. 
3) Caladbolg: actually seems to mostly create an explosion. Since it fails to hurt Berserker with a direct hit, Saber being in the explosion radius, or do more than scratch Shirou, it's not actually that huge.

Now, Archer's actual use of NP's in UBW? Caladbolg II whilst he [i]still has a Master[/i]. There's Rho Aias and UBW after that, but that almost kills the guy, and he's not even doing the insane 'charge these things with mana until they break' trick there. Plus it almost kills him. You're exaggerating.

That is: you're exaggerating the threat. This does not actually disrupt the general power balance.

[quote=@IncredibleBee]
Isn't Excalibur one of the strongest NP's though?

Besides, in Fate, most characters only get like one or two NP's as a trump card. Being able to summon that many all at once is pretty broken even by Fate standards.
If I were you, I'd choose lesser NP's, make a list of which ones specifically, and keep track of prana usage and stores.
[/quote]

See the suicide comment. Only time Excalibur's properly copied in F/SN? Kills Shirou in the process. All the NP's are crippled compared to default. Kanshou and Bakuya don't have particularly amazing abilities.