Pros
Great and supporting environment. The people mostly are excited about their projects. People try to be accommodating of real life. Bioware also creates great games consistently. Even the games that haven't sold as well are still respected. It's a great name to have on your resume. There are good opportunities to do cutting edge work.
Cons
Bioware has somewhat of a crunch atmosphere. Project schedules tend to run tight and there are year or longer crunches and sometimes perpetual ones with little breaks. Crunch has always been seen as necessary. In the past, there was a camaraderie that made this tolerable. It felt like the company had your back. By the time I left, there was a growing sense of uncertainty. It felt like layoffs could happen any time to anybody. Just one bad project and everyone would be out the door. Bio used to value people over projects, but now that seems reversed. It is possible that this trend will reverse again with shifts in leadership at EA, but be aware, I've heard of people move and then getting laid off within months. Also be aware that each Bio studio is different. Edmonton, Montreal, and Austin are all somewhat different.