Pros
Plenty of room for advancement and is known for their training. If you want to leave and go to another bank, having Wells Fargo on your resume looks very good. Benefits are pretty good. If you can deal with the first step of being a teller, lots of room for growth. They mostly promote from within.
Cons
The selling environment is almost predatory on customers. I have seen several people come in with multiple checking accounts and savings accounts where they were being charged monthly fees. Many times, they were unaware of the account(s) because they were duped into signing up for it. Many non-English speaking customers fell prey to this. Also, the selling environment is very intense especially for tellers. They put a lot of pressure on you to hit and exceed quarterly goals. The pay is horrible and you tend to get crapped on from all directions, i.e. management, customers.