There is a lot about the firm that is great. It is a great culture that values collaboration (below the partner level), that truly values diversity of its employees, and that is very collegial.
It is a place where you can build a great career if you can deliver great work, excel at networking across the firm, and can build partner support. Exceptional employees are the "average" here, so if you aren't knocking it out of the park all the time then you can expect to only be rated in the middle of the pack, and receive nominal raises and performance bonuses.
It has a strong brand in the market. The firm's latest brand health index rated it at the top of the other "big 4" firms (Deloitte, KPMG, and EY) as well as other non-audit/tax firms like Accenture.