I didn't find it dry at all. Did I drop my book in the bath by mistake?
I did find it annoyingly repetitive at times, but I chalked that up to Iriving writing for a popular audience, with Internet-shortened attention spans. You really have to hammer things in over and over again, these days.
I find Irving's edits to the philosophy not-particularly-helpful : his attempt to turn the traditional 'dichotomy of control' (things you can control, and so care about, and things you can't, so don't) into a trichotomy (adding things you have influence, but not complete control over), for example, just confuses the issue. Even he tells you not to worry about things you only influence, but to focus on the aspect you control -- exactly what the Ancient Stoics would tell you with their dichotomy.
That's okay, though. It's a decent introduction, with lots of practical advice and techniques, which are hugely helpful.
If you're looking for free resources before you buy a book, there's quite a bit online.
The Stoicism Today blog is excellent, and has a lot of resources put out to support its annual "Stoic Week" (want a free course on Stoicism? They have a free course on Stoicism.)
http://blogs.exeter.ac.uk/stoicismtoday/A friend of mine started from
https://howtobeastoic.wordpress.com/stoicism-101/which gives you most of the tricks in one easy package. (More specific with regards to technique than MMM's overview.)
The only thing I didn't really agree with the stoics on is their viewpoints on sex. They basically advocated that sex should just be used for reproduction. Though I'm sure enjoying life and sex with your spouse is different today when we choose someone we're compatible with emotionally, rather than the logical arrangements they made in the past. A lot of the stoics seemed to dislike other people for their flaws, which I'm sure contributes to that. I personally don't have that hang up.
Remember that there while AIDS and syphilis hadn't shown up yet, there
were venereal diseases in the ancient world, and no effective medicine. Anthropologists have shown that there's a correlation between sexual prudery and disease pressure*. There's also the issue of birth control: if you haven't got it, sex had better be for reproduction, or you're going to be disappointed.
Now, there were birth control methods in the ancient world (sheep gut condoms, sea-sponge diaphrams, an herbal 'Plan-B' called silphium that went extinct from over-harvesting during Nero's reign), but... would you trust any of those? Silphium, maybe. But given it was rare enough to be driven to extinction, it was probably restricted to the upper classes. So, in accordance with their philosophy, the Stoics stay in harmony with the reality they know: that sex often resulted in reproduction, and could make you very, very sick if you were unfaithful.
Our reality is different. We have effective birth control, and can make sure our partners test for STDs. Therefore we do not have to adapt our values in the same way the Stoics do. We're free to apply their philosophy to the sexual environment we live in, which (through negative visualization, occasional abstinence, etc) will allow us to extract greater, more mindful pleasure from the experience while simultaneously not becoming too attached.
*(indeed, some contest that it was widespread antibiotics to cure VD that prompted the sexual revolution at least as much as birth control, which was not yet available in many areas during the Summer of Love. Rates of extramarital sex were believed to have been on the rise even before The Pill was invented.)