You call 7 clicks/s slow?? The best I can do is about 8.8 clicks/s and that's like way higher than the average person here who do about 5-5.5 clicks/s.
Yes I do. I can do it without any effort (ie with my thumb and without changing the position of joypad) so I guess that's slow or at most avarage.
Google the issues people had. It is more common than you might think.

When I played GoW on the PC I tried it two-three lives, which translates into 20 or so tries, then used a macro that pressed my alternative bind for the o key.
Been playing Valkyria Chronicles a bit, about 6h in, a lot of fun. Though the super ultra mega huge aim radius is a bit of a drag. A mission with one rocket person, 2 tanks, 7! misses in a row of that glowing thing on the back. Also resorted to reading a book while playing the skirmish games since they are too simple, at least in the early game. Getting the A grade on campaign maps is a lot of fun though, without that grading I think the game would die for me (things like running a scout around and capping the objective flag takes time to find the route for). Too simple, the ai simply sucks. Hopefully it gets harder later in the game.
Edit
A question, does the PS3 add black borders if I connect it to my monitor that is 1920*1200 pixels? Or will I get a stretched image as I think? (My monitor does not support 1:1 pixel mapping.)