Weeks is just the Oliver Perez of position players.
Last season I gave up on Ollie. However, when you look at his 2007, he was very helpful. The problem came when you tried to spot start him. If you did that, you'd inevitably spot start him on his bad starts and bench him on his good ones.
The only solution was to start him every time knowing that on the aggregate, you'd get a good pitcher out of it.
Weeks is the same way. You absolutely CANNOT spot start the kid. You either make a commitment to his talent and start him every day, or you stay away. If you start him every day, you'll have plenty of days where he goes 0-4 with 2 Ks, but you'll also get the 3-4 with a HR and 2 SBs days. On balance, you'll have a plus 2bman.
That's assuming that the Brewers give him ABs.
If you're willing to ride out his bad games in order to ensure you catch his good ones, Weeks is a fine player to grab, especially around 220-250.