I have played it when it first came out in autumn 2011. I have played it for about 8 months. really liked the game, played as many different characters, but the coolest was my khajiit shadow assassin. I did almost all quests, though, i have never completed the main quest, because i thought it would kill my gaming pleasure when starting all over again with new characters.
I made many characters all close to lvl 50 with a few lvl 100 skills. My favourite quest line is that one of the thieves guild.

As for my playing style, i love the assassin-like playstyle (like that from assassins creed). using cool daggers and bows when in stealth mode.