It is a very accessible work, still today. The writing is clear and simple.
It's always been a popular work across the centuries, but the form seems to work well for contemporary audiences. You can engage with at different levels, it doesn't require a deep commitment. You can read a few passages before bed time, leave it for years and pick it up again, leaf through it and skip back&forth. As you grow older, the depth of the work reveals itself.
Specifically, given the easy to digest form, Meditations is somewhat of a board room coffee table book, like Machiavelli or Sun Tzu. There is a lot in there about what it takes to be a good leader.
It is a primary work. As a reader, you will take a trip back in time, when people were, for lack of better word, different. The deep religiosity on display can come across as somewhat alien, especially since it is one that focuses on the importance of the observance of rites rather than on establishing a personal spiritual connection. It is very un-american, un-christian, and that journey is valuable in itself.
The breadth is wide. Stoicism is easily dismissed as being somewhat of a dour, pessimistic philosophy. There is undoubtedly a melancholy undercurrent in Meditations, but it is also full with love, joy, kindness, happiness. The opening sets the tone. A thoughtful thank you note to all the people who Marcus feels affectionate to. Near the end, after being reminded a great deal about your mortality, those bright colors will have lost their luster somewhat, but Meditationes leaves you with more confidence in humanity and love towards your fellow man than with less.
Marcus Aurelius was by all accounts an admirable man and an important historical figure. There is somewhat of a voyeuristic kick you get by reading something he never intended to publish. Especially when writing about his wife, his insecurities, his unpleasant views on sex, all are more personal passages than philosophical. It's been 2000 years, I'm sure we're forgiven.