Well that is an abrupt ending. They do a lot of building up to it, and then they kind of leave us hanging. No final boss either, which is disappointing because I did like some the bosses.
The story isn't much, although I do like the way is presented. Short and to the point in game mission briefings form the NPCs, and a lot attention to making the towns seem alive. Everything has a nice little charm to it. Even the different enemy gangs have more identity to them compared to the cannon fodder in most games. Only the Authority is a bit lacking for being the main enemy.
I like all the little RPG elements they added. Like buying your own ammo and building your own items. That way there is always plenty of what you like the most. In my case Pop Rockets and the awesome Spider Bot. That thing really puts buddy NPCs in other games to shame. It actually shoots at enemy, they also consider it a valid target, so you can either protect to keep it going a little longer, or use it as a distraction. Just looking at thing blasting away, climbing on things, jumping on enemies that come too close, is fun to watch.
The shooting feels great, the cars handle well enough with some upgrades and add some nice variety. Overall I really like this game. Next to DEHR and Crysis 2 it's one of my favourite shooters this year. I spend 22 hours on Normal, and I think I have finished most of the side quests.