Yes, LAMBASTED is a Scrabble word!

Letter values in Scrabble US: L 1, A 1, M 3, B 3, A 1, S 1, T 1, E 1, D 2.

Is it a valid word?

LAMBASTED is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

Also: call on the carpet, take to task, dress down, call down, bawl out, chew out, chew up, have words.