Raymond L.
Yelp
I only started to visit this place more regularly after the completion of the Circle Line, as it's just next to the Esplanade station. But Marina Square does see quite a bit of traffic, as it's linked to two hotels.
As far as malls go in Singapore, this is pretty much unremarkable. You get your usual brands, shops, restaurants, event space, etc. But that doesn't mean it's bad. It's a very pleasant mall with lots of stuff to browse, and I quite like the layout and rooftop of the place. The food court, in addition, is worth a try.
On the upside, this is the only place with a bowling alley for miles and miles. There's also a cinema tucked into the corner, which I highly recommend as the only other cinema in the area is at Suntec, and that one is run by the less popular chain Eng Wah.