Pros
About the only identifiable "Pro" is a decent salary -- but that has far more to do with the dynamics of the oil and gas industry than with Wood Mackenzie in particular.
Cons
I was very excited about working at Wood Mackenzie, because the position I took was perfectly suited for my skills and interests. I was sorely disappointed. My immediate co-workers were just awful people: petty, arrogant (without the real achievements that might justify being so), undermining, and often outright mean. The company also lied to me about a key parameter of my job during the interview/contract signing period. I felt insulted, devalued, and I voluntarily quit -- even though I expected at the outset to be at the firm at a minimum of several years. Finally, for a data-heavy information and analytics firm....WoodMac is light on technical skill. Co-workers kept talking about their "models" of upstream research, by which they just meant: Excel files, with no actual "modeling" component to it. Being a glorified Excel jockey is fine as a job, but the way WoodMac does it is shockingly inefficient and poor.