Im sure this topic has been discussed many times on this site, but I looked for a little bit and couldnt find it. Anyways.... is the +3% to Hit Scope worth getting?

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There really are a few sides to this. If i knew your class (profile :p) I could probably come up with a more substantiated answer. Failing that, in the thread about buffs -Flask of the Titans- getting knocked off it was brought up that alot of enchantments and the likes take up an extra (hidden) buff slot.
However I believe that was the old one that gave 3% to hit, both melee and ranged. Assuming you are a hunter, it all depends what you are sitting at in terms of +hit. 9 seems to be the magic number against level 63 mobs. If you already have that, go for a +7 dmg scope instead. If not i guess the accurascope could get you there.

With your profile (and perhaps ctprofile) I'm sure someone could have given you a waaay better answer. Failing that, you can find alot of hunter information and theorycraft right here

Just checking - the +3% to hit no longer applies to melee damage correct? Only ranged?

officially it's no longer affecting melee hits, and as far as I know it's not bugged, so indeed, it only applies to ranged.