I'm going to lose my whole three day weekend to work. What a waste.
Alternatively: What a shame.
You're too good for me.
You deserve better (than me).
The only cars I can afford are all beaters. Oh well. That's the way it goes.
Alternatively: Nothing I can do about it.
beaters → piles of junk, clunkers, POSes
You overslept again?! You're hopeless.
Alternatively: You're unbelievable. / What am I going to do with you?
It's no use getting angry. That class never quiets down.
Alternatively: Don't bother getting angry.
I have to do it every day? What a pain.
Alternatively: What a bother.
He takes everything negatively. He's so obnoxious to be around.
Alternatively: He's such a pain. / I can't stand him.
Cancellations must be made at least one day in advance. Your understanding is appreciated.
Alternatively: Thank you (for your understanding).
My name's Taro Yamada. I just moved here the day before yesterday. It's nice to meet you.
Alternatively: I'm looking forward to working with you. / I'm looking forward to being a student here. (etc.)
These contexts and translations are not exhaustive for any of the introduced phrases; however, they may provide an idea of possible ranges in meaning and usage.
Have any other suggestions for these phrases? Please share in the comments below!