Which is not necessarily a bad thing. My campaigns are not dependent on having all the players who started staying through to the end and some rotation is part of the game. If this is something that indicates early to players that they won't be getting the kind of game they are looking for in my campaign, that's another benefit.
In some games, yes. But with 5th edition in particular, I don't think it's really possible to get truly awful stats.
There is a 0.5% chance to get a character with one or more scores of 3. That's one in 200 characters.
There is a 7% chance to get a character with one or more scores of 5 or lower. That's one in 14 characters.
At 4th level, you can increase that 5 to a 7, for a -2 modifier. And -2 is not terrible. Especially when you can decide your worst stat goes into an ability your chosen class does not rely on much.
And if by that point you still really hate your character, you can always start a different one. Nobody is being forced to stick with the same character just to play in the campaign.