If you're just getting started in the business, this is a solid place.
As you progress, it becomes less and less ideal if you're a creative hoping to have real influence on the work. Like many agencies, they tout the old "a great idea can come from anywhere" philosophy. And though they successfully practice it they do so at the risk of demoralizing creatives. Lots of disenchanted ADs and CWs. They also have these account/creative hybrids called "conceptors." While this model works for them, it might leave you miffed if you're used to a more traditional agency structure.
There's also a habit of handing out titles a bit too eagerly. What they call an ACD would oftentimes be a mid-level creative at most shops. Just an assessment; not a knock.
On the flip side, account executives can certainly thrive here. In fact, the client relationships for conceptors and account executives can have a greater influence on the creative (and, ultimately, success) than anything else.