Overall, I quite enjoyed X/Y -- of greatest contribution to this was obviously the new design and aesthetics and it was overall, quite enjoyable.
How was the variety of Pokémon?
Personally, after a full walkthrough on X and partial on Y, I was quite impressed with the variety that could be encountered. There was a good balance of nostalgia (the likes of Pikachu in the first forest took me back a little). Whilst I found the new additions were not all that great, I did appreciate a number of them -- Honedge, Inkay, Heliptile and Froakie I quite enjoyed. Having said that, the availability of prior generations was also quite good (considering I've been out of the Pokéverse since G/S -- played platinum and white 2, but nonetheless a big absence from the franchise).
It did feel like there was just more to be found everywhere (from my recollection of prior games, also the points at which they can be found) such as the Pan's in the first forest, fletchling, etc. I did find about mid story and around the fairy gym that I kinda didn't want to battle randoms and catch them, rather get a little deeper in the story line.
How was the level curve?
I would have liked to see it a little more challenging, playing my first run-through with a fairly ad-hoc team didn't seem a challenge until around gym 6 then I really started to feel that curve kick in. Perhaps a difficulty setting in the coming generations would be interesting?
Do you enjoy the character designs?
Character designs were, decent. It was interesting to have a group that follows your story a long which was refreshing. Still a few eye-rolling moments when the bleedingly obvious was stated (see below). However, overall I think it covered a decent balance of keeping the story flowing and 'helping' people new to the franchise.
Overall, wasn't blown away by it, but also I respect how it was done. Perhaps while finishing my current run through I will spare a little more attention to the characters and reserve judgment until then.
Do you enjoy the new Pokémon?
For the most, yes -- have I used them all? Nope. As I mentioned above, this was my first serious play through of a game since Gold/Silver and to a lesser extent Platinum. To me, there were a LOT of new encounters, however gen 6 specifically, there were a few mentioned above that were quite cool. Also, the evolution requirements for some were not as conventional but still surprising.
Something I would like to draw attention to, is breeding in X/Y -- what an improvement! I had some some egg-move breeding in W2 however, never invested the time in getting IV's and nature due to the complexity.
X/Y was great in this aspect, the mechanics were good (destiny knot, in particular) and aesthetically, watching the bicycle light turn on at 8PM after many cycles back and worth kind of became a novelty after a lot of breeding.
A little off-topic but a HUGE shoutout to
TheMantyke for the guide that he wrote -- was a great starting point and really helped me go from no breeding experience to now, quite confident and certain on how to get a particular outcome.
I am interested to see some other reviews (particularly those who have played through existing generations as they were released) overall I thoroughly enjoyed it. A few gripes and I would have liked to see the story become a little more complex, less linear and a bit more unique to previous generations. Such as the 'baddies' trying take over the world/destroy it is a little old -- but at the same time I enjoy the nostalgia in it. Would be great if Jessie/James got a cameo as well as team rocket!