Many of these have been listed here before, and I'm leaving out a lot of things people have issues with, but in the hopes that something actually gets improved, here's why I'm pretty close to abandoning this game all together, and certainly not spending any more money on it. If BB chose to fix a few of these things it might make pvp viable for longer than it takes for people to get to level 15 and realize they don't care enough to push on to 30:
1) Making pvp weapons is very expensive, even with the reductions in cost we saw a few months ago. This is a barrier to entry for anyone without a flourishing economy, for example anyone that isn't high level.
2) Making pvp weapons takes an insane amount of time, even at level 5 armory. This means that those of us who have nothing left in this game to accomplish outside of pvp will now only want to play once every 2 or 3 days instead of every day. This is not great for settlers, in that people who don't play often don't spend money...and eventually just stop logging on.
3) If you do somehow put up with numbers 1 & 2, the resources you gain are not just low, but pretty insulting. Honestly you might as well just have no resources if that's how you want to play it. This applies especially to tier 3 large maps, where the vast majority of available colonies are coal, iron, hardwood lumber and marble.
4) To make things worse, there is an artificial cap on how many resources per 6 hour period we can make. If you somehow manage to take 6 tier 3 huge colonies, you will not be collecting on them all. This is like a knife in the back of the people who make it through all the previous obstacles. Why strive for greatness and go after the hardest expeditions if it is more profitable to go after the second-hardest ones? (better chance at granite and titanium and fewer troop losses).
5) The fact that there is some sort of ranking system now is nice. The fact that I can't search it and see any of my friends or guild mates (unless they are top 10 or within one position of my own) makes this rating system fairly pointless. I also can't see what pvp level my friends are, other than visiting their island, looking at their water castle, and knowing within 2 levels what they are.
6) Which brings us to number 6...if somebody actually sticks it out despite all of these issues, they are rewarded with a slightly nicer decorative item than everyone else. Seriously?