Bad:
If you remember cattle class from years back - that's domestic first class now - Average service, usually edible food, may have to step into aisle to let window passenger get by, food included.
The old days of personalized service on many FC flights is gone as is much of the leg room except on some bigger planes.
On a 3 hour flight, food doesn't hold a candle to what it used to be.
Good:
Much better than cattle class.
Food free
Alcohol is free
Baggage free. So the net difference in cost from cattle class is less than the ticket price shows.
Room to store carry-ons and assistance may be provided.
The crew doesn't look down at you like a waiter does at a fine restaurant. They actually treat you as a human.
Seats are wider so you don't have to share yours with the fat people on either side of you.
Your knees don't actually touch the seat in front of you.
You get to board first so you can watch the cattle be rushed to their section with cattle prods so even though your head is lower because you are sitting down, you can look at them with the same sneer as that previously mentioned waiter.
You may get to go through priority TSA screening line