Should they get rid of Kett?

They should get rid of everything Andromeda completely. Establish Sheploo-Destroy as canon ending in trilogy, and let us explore milky way, both known and new systems, in the aftermath of war with Reapers.

Geth-heretics again? No, thanks. That amount of cheesy stupidity was enough in OT.

What? I thought the Geth heretics was one of the better aspects of ME2, especially when Legion speaks about it in terms of mathematics. Before Legion's introduction, the Geth were basically just robotic mooks that had some kind of technoreligious devotion to the reapers. If the geth stayed that way, they would have lost their value in the narrative after the first game, since there's absolutely nothing more to add to that. Adding the division in their consensus made them more complex a faction and gave us the possibility that they don't all have to be hostile 100% of the time. 

I agree to a degree. They did get kind of samey after 60+ hours to fight and while their story for a first game is serviceable i dont think they should remain the main focus of the new games. I personally do not think they're as interesting as the Reapers. Thats what i felt slightly disappointed with. The threat of the Kett didnt match that of the Reapers and the Archons face made me laugh sometimes. Kinda reminded me of a doll with those weird eyes and shiny cheeks.

Point is the just dont seem threatening enough compared to previous enemies. They should stay in it, but not be the main focus in the next one.

Sure, I am willing to provide myself as antagonist model for future ME game for 1.5% of total profits from game sales. At least antagonist would not be lousy that time. Now where do I sign? 

This cat lizard better have a good boss fight though, like fighting a wyvern in space. 

Well, the heretic Geth didn't "become good" because of ME2's revelations. Their actions were still evil, and they remained evil. The realisation that not all Geth are the same added depth to their race by providing insight. Likewise, although the Roekarr can be described as "evil", that doesn't make all Angarans evil. There will almost always be disagreements in methodology by beings who have higher thought.

I was hoping we'd be able to ally ourselves with Kett traitors who wanted to rebel against the Kett authorities, however after learning more about them and realising how deeply exaltation is ingrained into their culture and biology, I find it hard to believe that there would be a significant force of Kett who would go against it.

The Kett remind me of Halo's Covenant, and as a huge Halo fan, that's a good thing in my eyes. Instead of getting rid of the Kett, they should be developed. Their culture and society should be explored, as well as all the races they've subjugated and exalted. I want to learn more about their leaders and technology and the intricacies of exaltation. I want to be able to recruit their vassal species to rebel against them, creating an event similar to the Great Schism.
At the moment, I find it hard to see the Chosen and Annointed as "true Kett". I want to see the differences between the Chosen and "ancestral Kett" in terms of their status in Kett society and individuality. Are the Chosen Kett individuals in the same sense that individuals from other species are?

Every last Kett should be exterminated with extreme prejudice by Ryder and company.