'Character driven' - I just love reading about smart people and Miles Vorkosigan is as smart as they come. But he's also human (in a way that Sherlock Holmes is not, to me anyway.) Plus great action and adventure and plots so complicated that they're still enjoyable on the second (or third) reading. Start with 'Shards of Honor' or jump in anywhere.
Interesting characters in an alternate reality that has a nice balance of difference and familiarity. This series (the fifth just came out) is more like a soap opera than a novel - it moves very slowly as it follows many many characters (in detail - what they ate, what they wore, who they killed.) If you're OK with that, enjoy! If you need a resolution in the books you read, these are not for you.