I actually work on this particular aircraft, and it is fine!!
Yes you're right the aisles are narrower, but it looks much worse in a picture than in reality.
The legroom isn't affected at all, The BA DC-10's were all configured 3-4-3 or 2-5-2 and the 777 is wider.(the DC-10 used to operate these routes)
It is a great aircraft to work on although it is very busy because of the sheer number of pax carried.
There is no first class, 28 Club World and 355 World Traveller.
There are three aircraft in this config and they fly to:
All these route have been deemed to be unprofitable using first class during the summer as they are primarily leisure routes and they compete with all the UK charter airlines and Virgin 747 3-4-3. Almost all the flights are absolutely chocker block full and over booked all the time. If they put any other config on, they could not meet the demand.
All seats have the pvt's with 12 channels, legroom of between 31-33 inches coach and a recline of 5 degrees it was 7 degrees but it was way to much.
Service runs smooth and there are enough facilites for all, so until you try it don't knock it!!!