Your success here is based completely on where you land and which projects you end up on. If you end up in a city with good leadership, get noticed, and get staffed on a high-profile project with said leaders, then you're pretty much set - you've got yourself a clear path to Manager. If you don't, then you're pretty much screwed and have to get lucky.
There's a dearth of interesting projects. Many projects sold are very IT-focused yet they staff MBA-level management/strategy consultants on them with no interest or background in IT. But because of relatively small firm scale (~200 consultants) and how few projects are sold, you have little say in what projects you actually get to work on.
Severe lack of training opportunities. Every year, about 20 consultants in North America (<10% out of the 200+) get plucked to go to Les Fontaines, France for some annual training thing. The rest of us have some outdated online training modules to go through.
Your success at the firm and ability to get on projects is predicated entirely on networking and getting in the good graces of certain leaders, not about your skills or the quality of your work.
Company has shifted direction 5 or 6 times in the roughly 3 years that I've been with the firm and they still don't have a clear GTM strategy, which has hurt the firm's management consulting brand. Still known nationwide primarily as an IT firm.
Incentive comp is pitiful and is predicated on factors mostly outside your control (utilization is 60% of your annual KPI, so if you're not staffed, you're pretty much screwed). Offered a far-below-market signing bonus.
This firm has lost a lot of good, bright people, who've found greener pastures elsewhere. Almost everybody I know at Capgemini intends to leave as soon as they get the chance. I personally am just biding my time until I can get something better. I strongly recommend that people joining this firm reconsider their decision.