We've been talking about NG3 here already. It SHIPPED 600k copies. Those aren't necessarily sold to customers and usually aren't. Since copies can be sent back to the distributor they're not even guaranteed money for TK. Shipped copies are just a way of prettying up a figure that needs it.
Yep, pretty much. Shipped =/= Sold.
About reviews and how they impact on buyers, is not that clear. A bunch of bad (unpaid?) reviews can't boycott a game. Metacritic and its metascores as a whole is a different thing. Nowadays, some publishers have policies or clauses with the developer team, that involve reaching certain metascores for them to pay up some bonuses.
The thing is NG3 is actually a watered down, rushed game, and for that most reviews gave it lower scores (58 metascore, 4.1 user score).
Now, about DOA5. I'm not sure how big is RIGHT NOW the franchise in US or Europe. In Japan, there is a Kasumi-mania vibe that could boost sales, but considering last tittles were Xbox exclusives and knowing how much Xbox sells in Japan gives me the idea it won't sell in huge numbers there. At least, not for Xbox. Having it available for PS3 is actually great for that matter.
How much did sold DOA4? and DOAD? According to wikipedia (lol) DOA4 sold 1.2 million copies worldwide (no source, sadly). There are no numbers for Dimensions, but
TecmoKoei admitted it didn't sell as much they hoped . A fighting game for a nintendo handheld that missed launch date, so got fucked by SF4... it's not that easy considering all those factors, even if considering the positive reviews it got (79 metascore).
selling 1 million copies in september (worldwide)? I don't see it. But then, I'm just a PT who plays videogames... I don't know jack shit.