As has been mentioned, I do think the plot overall has been too repetitive, but I don't think the killing is the problem. Right now, I think there's been a lot of killing just to get the point across that a flip has switched in Jax. While it may be beating a dead horse, it IS a big change from the start of the show to now, especially since he's still pushing the overall agenda of getting out of that life. Killing, torturing, cutting body parts, not being upset at Tig for
; these are all big things to show how far down the rabbit hole he's fallen.
I agree they need to build some bigger story lines, but I think that is happening in the background. The Jax vs Clay may be repetitive, but I think it's getting bigger, especially with Jax's new attitude. I think the Clay/Juice conversation was a big deal, and the ending scene was excellent IMO. I also think Nero will factor in to this more as things progress.
Overall I think the show is getting more personal and gritty, which I think is a good direction. We'll just have to wait and see if the writers are going to make things a little more complex, or just stick to action and blood as much as possible.