Pros
Great benefits and salaries. Learning and development opportunities. Many bright and talented employees. Autonomy and flexibility common in many roles. Great growth and opportunity in portions of the business (i.e., 5G). Leading edge technology tools. Verizon is becoming more employee-friendly and nimble, and working to reduce bureaucracy. Much better environment than 5+ years ago. Given Verizon's size, your experience can vary a lot depending on the job, location and organization you're in.
Cons
Big company environment does still exist, including some of usual bureaucratic obstacles. Company faces ongoing headwinds from legacy businesses along with heavy competition and rapid evolution of technology, creating constant revenue and expense pressure. Long hours and heavy workload not unusual. Frequent changes in systems, directors/VPs, organizational structures. Lots of outsourcing and layoffs. Legacy telecom part of company is unionized with potential for all other employees to be assigned to strike duty every 3-4 years when contracts expire.