I've been getting a lot of resumes lately with very weak verbs. Many of them avoid using verbs entirely and just use the phrase "responsible for…" with everything on the resume.
No one gets hired because they had responsibility for something. They get hired based on the results they delivered. This makes it essential to use verbs that convey success. If you're having trouble coming up with good, strong verbs for your resume, check out this list of power verbs.