I tend to dip in and out. You’d be better off asking one of the harder-core fans here. I have only watched one or two episodes of Torchwood. It got tiresome very quickly.
Personally, I’m more looking forward to series X of ‘Red Dwarf’ coming out in October...
I quickly became enamored of Eve Myles (and her lovely Welsh accent), and ended up watching the episodes of the first three seasons rapid-fire and often back to back, over the course of less than two weeks.
The first three seasons of Torchwood are free on Amazon Prime while the fourth has a small charge for viewing each episode, so I will probably end up waiting until I have gone through the free episodes of Dr. Who before jumping in to the fourth season.