This is something I've dealt with a lot in the past, and I'll be sure you won't be the last to ask this question.
Despite what many people said about 5th Gen being "disappointing", it was mainly because they weren't used to the new Pokemon and some other stuff but I actually think Black and White were really awesome games in my opinion, the story is one of the most intense of the series and you can only use Unova Pokemon prior to the postgame which I think was kinda nice and fresh, because it gave off that "playing 1st Gen again" vibe. I actually enjoyed most of the Unova Pokemon (most of which are general faves of mine) so I did pretty well playing Black and White.
If you're one of those who doesn't like being forced to use Unova Pokemon, you can consider Black 2 and White 2 instead if you want a 5th Gen game. They fixed up a lot of stuff many found disappointing in Black and White, such as having older Pokemon in the Unova Dex and also a massive amount of stuff to do in the postgame, such as the Pokemon World Tournament and catching loads of Legendary Pokemon.
Some people skip B/W and move onto B2/W2, but if you like keeping up with the story, playing both B/W and B2/W2 is recommended. B2/W2 wins out features-wise, but both are really great games anyway, at least in my opinion. Sure, it may be a big jump in graphics as far as X/Y goes but doesn't hurt to keep up. It always never hurts for a true Pokemon fan to give every generation a go.
So, my conclusion is this: if you want to see both sides of the Unova story, get both B/W and B2/W2, or if you like the features more than the story you should get B2/W2. Good luck and happy gaming! Hope my statement answered your question.