Yes, Genki is my textbook of choice for beginners, but mostly for the reading comprehension exercises. The grammar can all be learned elsewhere (Tae Kim’s, JSPFEC etc), though Genki does a good job of creating a structured system with lots of exercises.
I found the structured reading practice worth the price, and if you wanted an offline textbook it’s the one I’d recommend. Whether or not a textbook would be right for you is another matter though, and one that only you will know the answer to. Some people do fine without them, others like them.