Just watched it now, didn't realise it had been leaked a fortnight ago -- waited for it to be aired in the States first.
A very good ending to a very good series, it's just a shame my second-favourite character had to die (Doakes), but there was no way he could stay alive really. I'm just glad that it wasn't Dexter who killed him, so at least he still has his code of not killing innocents. Although he was implicit, since he put Doakes there in the first place, and Lyla was only there because she wanted to find Dex.
But it was good she died. I loved that bit. I want to be a serial killer now.