Yeah I wish Renee hadn't died, but at least it led to Unhinged Jack, with Chloe trying to rein him in. It was a great way to end the series.
I'm happy to see 24 return, even though I thought enough was enough when it finished. I think that being in a limited 12 episode run should be good for the show, as they can plan things out properly. A problem that often occurred when it was first on was when they'd just plan a few episodes out at a time, which would sometimes lead to a disjointed feel.