There are many variations of builds for Lee Sin.
Cinderhulk + Titanic Hydra has been popular for a month or two now.
If you happened to miss it, I was advocating AGAINST taking Thunderlord's Decree with Warrior since it left you too squishy.
The main exception I can think of (when you want both Warrior and Thunderlord's Decree) would be when you desperately want early damage to shutdown the enemy team early-game
However, in that case you would probably have to build Deadman's Plate second rather than a second offensive item. The durability and mobility would be crucial for really shutting down the enemy team and surviving in fights.