I thought Atrium was pretty average in October last year. For the same price (or up to 20% more), i'd go Orchard next time.
They have refurbished and old style rooms. The old ones are pretty shocking (and I've written a mini-review about them before), but the new ones are ok. I agree for a small amount of money HI Orchard is a better option, but with the crazy SIN hotel prices at times, sometimes it just isn't an option!