I usually fly Aer Lingus to the U.S although next Sunday im going with Delta so will be interesting to compare.
To answer a few of your questions,the food is pretty basic but edible(unlike some airlines).
The entertainment is ok i suppose,a recent movie,an episode of Friends/Simpsons/Home Improvement etc and a tourist video about where your going to-standard stuff basically.
For Delta now its 50lbs limit for one bag and 20lbs limit carry-on bag,i assume its the same for every transatlantic flight reguardless of Airline.
By the way,i highly recommend going to San Francisco as opposed to LA,LA is a bit of a tourist trap to be honest.
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