Lue was a good player when he was with the Lakers. He was injury prone so he didn't get a lot of the developmental playing time until the series against A.I.
I gotta admit I was disappointed when they traded him, but the playing time he's had since then has made him to a much better player.
On the plus side, Lue already knows how to run the tri, has the quickness that we sorely need, and he was alwas a crowd favorite, plus the experience with MJ has to be a plus.
On the downside, PJ doesn't like small guards (reason #1 that Lue was dumped IMO), so his playing time will go down, and he may not be that sturdy.