According to Wikipedia (https://en.wikipedia.org/wiki/The_Last_of_Us) it's an action-adventure or survival-horror. However it also was awarded as Best Third Person Shooter from GameTrailers. Let's see if the Topic creator adds it to the OP.

I just went VGChartz/Game Data Base/Shooters. So TLOU didn't turn up and neither did any other new IP game in different genres that sold a million in 1 month. The only thing I see as an anomaly is Destiny, which is why I went hunting for it. If Borderlands is a shooter then so is Destiny. TLOU isn't a shooter. There are too many segments of the game where you can get through without firing a single shot (or arrow). You melee, shiv, pipe smash, molotov and stealth your way around, which puts is well beyond the shooter genre. There are other games I'll grant you in the action / action/adventure category which could more justifiably be called shooters, but I wonder how many of them did 1 million in a month for the first entry in the franchise.

Much as I'd love to put TLOU in there because I love that game. I don't feel it belongs in the shooter genre.

Sorry I didn't notice the :P, possibly because I do it ...

Yeah I thought you might have been casting aspersions with that final question so I might have answered a wee bit snarky.

2.5 million by year's end? Wii U does have a limited install base, and it appears Splatoon is mostly preaching to the converted rather than bringing in masses of new buyers (though NPD for June may tell us a different story). So Splatoon can only sell so much before it reaches rather a saturation point. For all that is is a successful new IP in its own right I don't see this first entry pulling MK or SSB level of sale. But then I thought 700K LTD would be a decent result for Splatoon, so what do I know?

on wikipedia, metacritic, it says its an action game. No where even says its an shooter

To be fair. Shooter is a sub-genre of action. But I still agree that GTA shouldn't be categorized as a shooter. Action-Adventure is more fitting. 

Last of Us and GTA being recommemded as shooters?

I may as well recommend the first person portions of Wind Waker HD as a shooter

I would consider TLOU a third person shooter, even though you can beat the game on any difficulty without firing a single shot (except for the part that you play as Ellie). Also, I've always considered GTA a Third Person Shooter. Now it's F/TPS.

According to Wikipedia, Halo: Combat Evolved took about five months to crack 1 million copies:

"by April 8, 2002, a little under five months after its release, one million units had been sold".

The later games in the series did this much quicker (Halo 2 had more than 1 million pre-orders) but looking at new IP shooters, Splatoon seems to be one of the strongest launches we've ever had.

Thanks hiska-kun!

Unfortunately, you leave lawlight indefense.

Bloodborne