Pretty much everything else. Look, it's adtech, so you shouldn't be expecting to be inspired and passionate about your work. It's professional BS artists slinging BS at other BS artists. Know that coming in. Even with that said, it's a hollow place, and I'm legit confused by all the positive reviews on here.
The company hasn't truly rolled out a new product in years and all the current stuff they like to crow about is vaporware. The product & engineering planning and execution is laughable - it's almost impossible to get anything done and everything is factionalism and fiefdoms. Development is driven entirely by promises made by sales and exec to big-name customers without bothering to think about whether the product supports it or even makes sense as part of some larger vision or strategy. That's because the only vision is "close more deals."
The people at the top stumbled into and inherited a good thing (almost none of the people who started and built the company have stuck around) and think they're savvy leaders when really they mostly just were lucky enough to be in the right place at the right time.
There is a good original business here, but that kernel of quality has since been covered by layers and layers of botched execution and an inability to focus on anything for more than 2 months. Executive ranks are bloated by absorbing too many leaders from acquired companies without a plan for what they'll do. You end up with a closed-off inner circle that doesn't have their pulse on what's actually happening and nobody actually focused on execution.
Don't believe them when they say they have a solution for 3p cookies - nobody does and everyone is hoping someone else will bail them out.