"What makes Pokémon black 2/white 2 the best or at least a very good game?"

So if there is one game that I see many people consider the best or at least in their top Pokémon games is black 2/white 2, I was wondering as a person who do love Pokémon but not an expert and only played the old ones really really long time ago, what is so special about this game? The way I see it ( and I can be completely wrong) game freak pretty much just covered the formula over the years, just changed the graphics and the Pokémon type. So I was wondering makes this game so special or better than other Pokémon games, because I want to play Pokémon but I only have time to play one game so I would prefer to play one of the games I used to play when I was young for nostalgia unless black 2/white 2 is really something else via /r/pokemon https://ift.tt/TQkZxBX