I got invaded for the first time last night, and just made the dude look silly. Might have been his first invasion; he didn't seem to have much of a plan. He never used any ranged attacks, but he kept his distance a lot. I think once I took some of his health and then refilled mine, he wasn't interested in trading blows with me. I wonder if he knew that invaders can't drink? Seems to me that if you invade, you have to be on the offensive. Your target is going to have up to 20 Estus Flasks, and you're not going to have any.
That experience really makes me want to join a covenant and get more involved in multiplayer PvP. I used to play WoW a lot, and this is a far better model for "world" PvP than WoW has. You're near the same level, and both players stand to gain or lose stuff that is meaningful to them, but not crippling or tragic.
Did some great exploring, opened some doors, found at least 3 new vendors...and finally worked up the nerve to try the Gargoyles. I got the tail weapon on the first try, but I died about 5 times before I decided to just blow a Twin Humanities I had picked up and summon some players. I got two dudes in there with me, and we made quick work of the Gargoyles.
Rang the first bell!