Flying VA for the first time LHR-LAX

Hi! We are flying VS007 LHR-LAX April 30 and VS008 May 21. This is the first time we will be flying Virgin Atlantic and we are flying with our three small children aged 1,3 and 6 years old.
Apparently we are flying A346, and we have chosen row 41 mid section.
What can we expect for this flight? I've been reading so many bad reviews that I'm starting to feel a bit nervous.
Apparently we are flying A346, and we have chosen row 41 mid section.
What can we expect for this flight? I've been reading so many bad reviews that I'm starting to feel a bit nervous.