Alright, DS, I finished Dexter, so you're off my ignore list.
And about season 5, spoilers below:
I pretty much agree with you. The last episode was great until they copped out on Lumen. I was looking forward to Dexter having a true partner next season.
Ah, well. At least it wasn't as bland and tasteless as season 3.
And it turns out there weren't even any spoilers in your post - I just saw "Dexter" and didn't want to risk it.