I've mentioned I don't play online much if at all. There are the rare exceptions such as Killzone 2, Resistance 2, Motorstorm 2 and of course Uncharted 2 (hah, all sequels!). Anyway, after my brief play previously with the demo, I've now had a couple of hours worth of gaming time with it and I have to say it's really fun stuff. Well, three of the four modes are, there's one I got bored of quickly.
Deathmatch is excellent, but I'm a fan of team deathmatch and since I was in a party, I was automatically put in a team with my party members. First team to get the set number of kills, wins. Simple and fun.
Next on the list is objective. Again, being in a party led me to be in a team objective match, I'm not sure if this can be played with everyone being independent, I'm guessing not. There are two different types of objectives that I encountered, but there may be more in the full game. One is to capture nodes on the map. You need to stand at a node until it is captured with no enemies within range of the nod. This is the same as in Battlefield games. If your team captures all nodes, you win. It's a fun tug of war type objective. The other objective is capturing treasure and bringing it back to your treasure chest at your respective base. This is basically capture the flag and was very fun to play. You can throw the treasure (like a grenade or propane tank) if you need it to get across a gap or to a higher level and of course, you can't shoot if you're carrying it. But unlike capture the flag, where there are two flags (one for each team), the treasure is neutral and gunning down the carrier doesn't mean you can run up to the treasure and return it to it's original post. It lies on the ground waiting to be picked up again.
The third mode is my favorite. It's three player co-op in which you need to get to a certain area to find treasure and you'll fight bad guys together and do simple puzzles. It's like playing the singleplayer game and is excellent.
The final mode is the weakest of the lot. It's another three player co-op mode with an objective. As with the capture the treasure mode, you'll need to find the treasure and bring it back to your chest to complete the round. Waves of bad guys try to stop you from reaching your goal and each round gets progressively more difficult, but I find it much to repetitive and it gets boring quickly. It's a mode that I wouldn't bother playing ever again. In the co-op modes, you can also heal your partners if they've been mortally wounded, but you have a limited time to do so.
My only complaint is that unlike Killzone 2, players can't just jump in mid game if there are spots open from people quitting or there not being a full amount for that particular match. You need to wait to find and join a fresh game everytime, just like in Resistance 2. This wouldn't be so bad if there was something to do while you wait, but there isn't. And wait you will (at least in the demo), sometimes up to a few minutes before you join a match, but it's not too bad and maybe it will be shorter times in the full game. So there you have it, all the multiplayer modes in more detail.