Lee is fools gold. He plays zero defense, has no post game and gets injured a lot. He's older than Aldridge to boot. His contract is ridiculous too. The blue chips are klay and Barnes. Lee is just to make contracts work.
Lee is only in the deal to match salaries and give the Warriors relief from his overpaid contract, that is a part of the consideration given along with Aldridge and Wes. Lee is worth less than nothing in this deal. You could think of this as two trades, first Lee being bundled with two picks for Portland to absorb his contract and then Portland sending those picks back with Aldridge and Wes to get Barnes and Klay. If you think Lee has value find a third team to absorb his contract or trade us different players such as Bogut. Replace Wes with Batum if you prefer, although we then might need another contract from GS to get the salaries to match.