I sense that some here will disagree with me, but here goes.
The shotokan training I did was not geared toward self defense. I do feel that it would improve your chances in a confrontation. Its greatest strengths were in hand-eye coordination and hand speed. Its sparring by and large is pretty fast and pretty intense; in our class the free sparring was hard contact to the body but no contact to the face (punches always controlled). We either wore no pads or just those little football hand pads. Some people wore shin pads.
No contact to the face sucks. It was better than “point” sparring, though, in that shotokan judges wouldn’t score a blow to the head unless it was powerful and well-aimed. Still, it was a big problem at the time. There are better gloves now (like MMA gloves) that perhaps have allowed students to strike to the face. In any case, I did feel my punching improved a lot in shotokan.
Also, one point and three point sparring was helpful in developing pretty good hand-eye coordination.
The first time a sparred NHB, though, was eye-opening. Shotokan sparring didn’t teach me anything about standup or prone grappling, clinch fighting, spacial tactics (using walls, corners, furniture, other objects etc.) dirty tactics, psychology of confrontations, ground fighting, or submissions. There were all kinds of omissions, and they became glaringly obvious.
If self-defense is your primary interest, then I would say the kihon (basics) and kata (forms) of shotokan are pretty much a waste of time. If self-defense is only part of your interest, then I would say that shotokan can be very fulfilling. Its techniques are not flashy, and most of them are not “pointless.” But you have to enjoy kata for its own sake, and basics for their own sake, because if you don’t you’ll be frustrated by the amount of time spent on them. Also, they don’t add much, IMO, to your fighting skills.
Shotokan as I was taught it was a real zen thing. My view is that it is a first rate martial art, but second rate for self-defense.
Oh, another thing to keep in mind: most shotokan schools seem to have adopted the traditional mindset that the style’s own way of doing things is the “best” way. Don’t expect to be able to criticize or disagree with your instructor about very much as far as technique is concerned.
I sometimes consider getting involved in shotokan again, my I’m afraid my experiences in kickboxing and judo have pretty much ruined me. I find shotokan just too constraining and stylized.