When I started playing this game, I thought it was one of many terrible hacks on this site. I was genuinely surprised with what I saw. This isn't really a hack but a fix that makes this game even more enjoyable for a solo player: national dex from the start (I think), no trade evolution, no US and Japan exclusive events (actually no events at all; It's emulated after all).
I don't really know how to rate it 'cause I'm not rating FireRed here and there aren't that many changes: graphics, sound and plot are the same and only few new maps are added... wait a second! New maps? It calls for:

Graphics: 7
The new maps look great but sorta empty (especially Mew's island in Bill's machine). Can't say much more about them.

Addictiveness: 8
I rated addictiveness from nuzlocker's point of view. FireRed is easily nuzlockable but suffers from version exclusivity and trade evolutionness (Yeah, these are real diseases, I'm a specialist). Ultra Violet doesn't have this problem. It certainly is more pleasant to nuzlocke than the original.
Story: 4The only thing the creator of this hack messed up. Sevii islands got replaced with some meaningless island that is there only so you can catch non-Kanto pokemon. There was part of the plot on Sevii islands for crying out loud! The areas on the island aren't even properly labeled! There is no pokemon center! It has no purpose at that point of the game! And to get there you have to talk to some random girl! Why not use the Sevii islands boat script if there are no Sevii islands in this game! It makes no sense!
So yeah, if you ignore that nameless island, this game deserves a solid 8,5. Nuzlocking it was fun unlike some other hacks I played (inb4 you can stop if you don't like a game. My honor wouldn't let me do it, OK?).
It's well done, it's fun, it's nuzlockable, it's 8,5/10.

Umm... sevii islands are still in the game fully... they contain most of the gen 2 pokemon... 

I could not use the sevii island boat script because its still there in exactly the same spot... all 7 islands are there
You can even dobthe ruby sapphire sidequest

Well you need to review all of the elements of the game not just graphics and addictiveness. I would also suggest giving more information if you are just going to do graphics and addictiveness.

SQman : here something that every one noticed you missed every element of gaming. since you said just those ones you could have even more description for them. but it's still a good review