Because the product sells itself and the job is only as stressful as you want it to be, some people take advantage of that. You will work with some of the best and brightest, but you will also run into mediocre workers. Don't let that discourage you. Just keep pushing forward and your work ethic will be recognized in time.
Esri is slow to change, which can be good and bad. I listed it as a con because Esri tends to be too adverse to change.