"To put it simply, Gen V failed to live up to a big enough bunch of people's expectations in many, many aspects."
My apologies.
EDIT: By Request:
I. Lack of imaginative designs / types. Honestly, I feel they copy pasted a lot from Gen One, and while some of them really were amazing, I think that Game Freak could've done much better in that department, including (but not limited to) new interesting typings (there were some, agree, but only a portion. Like, who needed another Fire/Fight starter? And water/ground amphibian? water/rock fossil? Pure Psychic types?) and I also felt that the designs were bland and uninspired (an Ice Cream, come on).
II. Linear walkthrough. As said already, Unova is nothing but a line you follow, with only few hidden paths and sidequests. The sidequest part is the most annoying, really. DPPt had contests, Underground, Great Marsh and Battle Frontier, HGSS had, Pokéwalker, Pokéathlon (man I loved that so much) and various contests (bug-catching, Safari, etc), making the walkthrough interesting. B/W had, what... Musicals? Haha. Slap on accessories and watch it happen appart from tapping on them at times (2 max). Got bored quickly.
III. Boring post-game. Yeah, the sudden level boost was making things interesting for a while, but when you're done with that you're pretty much done with everything. Again, I got bored with White faster than with any other Pokémon game I've played so far.
Besides all that, though, I must admit that the Legendary Backstory (N's Castle and everything) was definitely superior in almost every aspect to the other games. I was blown away.
But this is only my point of view, of course. Feel free to love it, just giving away my opinion. Yeah yeah Wobbles you were right >:\
ANOTHER EDIT: Yeah I don't have wifi so no Dream World though...