Low pay - I'm sure everyone thinks they are underpaid, but KeyBank routinely offers you significantly less than what they even admit is the "market rate". If there is a pay range listed on a posting, expect to make 10-15% less than the so called "market rate"
Little linear mobility - In most areas of the bank, you must leave departments if you are looking to move up. Managerial positions rarely open up in any one department, you will have to zig zag through to company to progress. Also, they take advantage of internal applicants, moving them up 2-3 "pay grades" but only paying 2-4% more than their old position.
Poor Insurance - For such a large corporation, the health insurance is not very good. I am fortunate to have a husband who has great health coverage so I no longer use Key. Its has only gotten worse in the last couple years. Since 2011, premiums are up over 40%, deductible and out of pocket max have almost doubled, and coverage has gotten poorer. The most popular plan option for those with children is no longer even offered.
Financial Market instability - After the last financial crash, the bank downsized staff significantly (as is to be expected). Will the very strong potential for another downturn in the coming years, this may be a concern for new employees. Also, with instability, comes the risk of takeovers. Key is based in regional-bank-dominated Ohio, which may be appealing for WF, BOA, Chase, etc.