Ways I Would Make Assassin's Creed 3 Better by Orange Lightning
1.) Reinstate the "high-profile" button in conjunction with the button for foot movement. A single button for running/freerunning is just too imprecise, and leads to too many awkward mistakes during chases or normal traversal. I shouldn't run aross a ship and unintentionally keep hopping on cannons and ledges for no reason. It looks ridiculous.
There was no reason to change it. Not like it was complicated before anyway. This is a case of to much streamlining, and now the X button on the PS3 controller (or A on the 360 one) serves little purpose outside of battle. Unless you want to jump to your death, that is.
At the very least, give us an option of which kind of controls to use, rather than forcing the streamlined version on us.
2.) Allow cutscenes a little more time to develop, with more room for dramatic effect. As Riku mentioned, something like the scene in the tavern at the end was brilliantly done, and recieved the time it needed, but others (such as the actual Desmond-centered ending) feel hastily-thrown-together, with very little dramatic impact at all.
3.) More interaction with historical events/figures. The American Revolution backdrop is well-implemented in some cases (such as the Battle of Bunker Hill, the Boston Tea Party, or Paul Revere's ride), but by the end of the game, that backdrop seems to drop out of existence, instead focusing on the more mundane story of Connor and his own motivations.
No Cornwallis? No Vice Admiralty Courts? No press gangs? No battle of Yorktown (would have been the perfect end, utilizing British, American, French, and Indian troops all in the same place)?
Despite a few really cool uses, the time and place settings feel oddly under-utilized. Being based around a war , you would think this would be the most epic, large-scale AC yet; instead, despite a particularly large "world," the story itself feels like one of the smallest in the end.
4.) Make Connor more interesting. It's been said already, but Connor comes off as incredibly bland. His personality has almost nothing endearing in it, his insistance on "freedom" comes off as blind, teenage rhetoric, and his voice actor is simply unfit to play a character meant to hold a commanding presence. Byt the end of everything, I was left with no desire whatsoever to see this character given another game of his own.
Like Riku said, Haytham is simply the more interesting, entertaining character. Considering that he's Connor's father, you would think they would have carried over some of that swagger as an inherent familial trait, to further emphasize their relation and make the resulting events a little more tragic and affecting.
But no, they may as well have been completely unrelated. A sad missed opportunity.
5.) Keep the stealth generally the same as in the other games. You could argue that they should make it better , but that's exactly what they tried to do. In some instances it payed off (such as in the use of the corner-kills, whistles, and the ability to hide in thick foliage), but in others (the aforementioned over-alertness of guards, the immediate alarms, and the automatic enemy knowledge of your position) it just hurts the experience and makes it less fun. And I think the negatives affect the game even more than the positives do.
Keep the new features, but revert the "AI" back to what it was. It might not be a step forward in AI, but at least it wouldn't be a step backward. And that consistency with the old games would be a lot more fun (which is the ultimate goal).
6.) Yet another "revert back" suggestion, but the counter kills were much more satisfying to perform in previous games. Again, go back to the "high-profile" button setup. The new control scheme is just too easy, and relies a bit less on timing and skill than it did before. Granted, it's good that the new one makes you take different tactics with different enemies, but the exact same thing could have been done with the "high profile" button as well, without dumbing it down. The big red triangle flying up over enemies' heads doesn't help either. Just makes it feel too easy.
7.) Allow horses to take a couple shots before falling down. It's just retarded that while trying to make a daring escape, I can dramatically jump on a horse, valiantly ride five steps, then have the horse fall down under me when it gets shot a single time. To hell with realism; I want fun, and it's nigh-impossible to make a fun escape on horseback with these frail-ass, one-shot horses.
EDIT: 8.) Bring back the hookblade. Some of the greatest moments I've had in Assassin's Creed came from making a blind leap of faith and being saved by a quick-thinking use of the hookblade from Revelations.
If not the actual hookblade (which, granted, was pretty specific to the Turkish order of Assassins) then have Connor use his tomahawk in the same way, reaching out with it and grabbing ledges/speeding up climbing. Would look awesome and actually be useful.