I have no scientific proof of this but I’m pretty sure that everyone from my age and younger (from, say, 25 down to old enough to play games) has been exposed to Pokemon at some point. Whether it’s the games or the anime or even the trading card game (which Wizards of the Coasts brought to America to try to get kids into TCG and move them onto Magic: The Gathering), everyone knows Pokemon. So, naturally, it’s massive news and a massive event when Game Freak releases a new Pokemon game that is the first major update to the formula that everyone loves.
While the basic underlying formula of the Pokemon franchise hasn’t changed, that doesn’t mean that reviewers don’t love the latest entry into the franchise. The worst review right now is 70% because of the current lack of an import feature from previous games and some framerate issues. The rest of the critics still love the classic formula and adore the new 3D art-style that Game Freak adopted for their first game on the 3DS. If you already have an opinion of Pokemon games from previous generations, it’s not likely that your opinion of this game will be any different.