I posted a similar list of how to make Brink 2 more successful. All valid points by you, especially if approached by a single player or causal player. Lacking real people to play with, the game falls flat at times. With friends the games shines. Brink tries to be both accessible at times and contradicts accessibility by locking stuff, having separate challenges, and not having a traditional single player experience with linear paths.
Your top ten list reads as a compiling of all the popular criticism of Brink. Which most here are all too aware of. Thank god you didn’t have ET:QW or COD or the word TDM anywhere on your list! 
And like you say, SD has already begun to address the popular criticisms with DLC that adds maps (for Free) more level cap and are in the process of tweaking guns.
I had suggested another layer of level grind that involved unlocking Faction Specific progress to show which faction you prefer, because honestly not being able to play both factions in the way you can with Brink currently, would suck balls. 