I prefered the season 2.
I don't like Season 3 matchups. Like mid was dumb as fuck most of the time, with assassins snowballing hard fucking core all day after a gank (even if you don't get killed though, just be forced to go back, and you're out of the game for a good time unless your opp screw up or your jungle shows up big time). Mid laners have now SU MUCH kill potential. I mean, in season, you had to pick Gragas/Cass to have a good shot at killing your opp before the level 6. BUT NOW, damn it, good assassins with godlike splitpushing skills, insane pick-up-the-adc potential, and decent team fighting power thanks to retarded escape tools. Yea I know that many of the champs I'm thinking about are S2 material but they werent so popular (or have been nerfed asap and left down by players).
Supports gained sooooooooooo much more presence in S3 and I don't know if I really like that. It makes the botlane so random in soloQ because if your support is shit, you get shat on.
On top of that, if you get behind ONCE, it's just over, you can't pick fights and you get zoned like madness by shits like Tresh able to hook you from miles away and ccing endlessly RIGHT FROM THE LVL 2 (which means : get the lvl 2 first and shit on everybody) or crap like Zyra dishing out more damage than a dozen of ads put together and chain ccing you with lvl 6 and those uNgHRrrez plants.
And I mean, it's not only about soloQ games. I'm thinking about Fnatic vs Royal Club (pushing like fuck to get the lvl 2 first), just think about how many cs/exp Puszu gave up just because he was less good than his opp at laning. You just can't "passive lane" like before, now you get behind once and they abuse you all day. Obviously, it's not always so clear, as they can swap lanes and all so everybody is just forced to be passive in a 1v2 situation unless a now-totally-obvious triple dive happens.
Now you can have a support that can CC+RANGE+DMG (before the level 6, and even since the level2). But in Season 2, good supports were most of the time either range+dmg/heal or melee with cc potential. And not fucking everything at once.
Nah really, bot lane is being dumb imo, and games are being less and less team fight oriented (you see world cup games being over after a drake or a good gank/lvl 1 and then IT IS FUCKING DONE, you have the illusion to see some fighting, but in fact it's just the losing team thinking "we lost it 30 mins ago, let's throw ourselves into a random dumb baron/mid fight to end this shit").
And to people saying S2 games were long and boring, it was because people were AFRAID of taking risks because the outcome wasn't decided yet. It was a proof showing that the game was intense and nobody wanted to make a single mistake.