Some years back, Dave Chesser posted an article in which he suggested that the acronym BJJ, which a lot of people mistakenly think means Brazilian Jiu-Jitsu, actually means Basically Just Judo. I laughed my proverbial asterisk off - particularly after asserting for so long that Judo and BJJ are just competitive brand names for the same thing.
The other day I managed to dig up a copy of a book I've been looking for a long time, Feldenkrais' Higher Judo Groundwork! Fantastic book! Following are a couple of pictures from this book, published in 1952, showing some judo moves that a lot of folks think of as distinctively BJJ.
First we have a minor takedown that is allowed and used in BJJ contests but is disallowed in Judo and is derisively known by some as 'buttflopping' (watch out for some mildly offensive language if you follow that otherwise hilarious link). Feldenkrais presents this as a good way to take the contest to the ground if it is allowed in the rules. Note, please, that if any of you smartaleks ever do this to me or do this in my club, get ready for a ride you'll wish you hadn't signed up for. Feldenkrais' variant of pulling guard shown here is extremely dangerous and places uke at a great risk of breaking his ankle. But it is judo per Feldenkrais' 1952 book - not just BJJ.
Secondly, we have a guard pass into a leglock. Again, commonly thought of as the domain of BJJ. Wrong again. This stuff is judo - it is just disallowed in judo shiai and usually in randori - partly for safety, but partly just to allow emphasis to be placed on other stuff so you can become better in a smaller technical range.
Anyway, there is nothing at all wrong with Brazilian Jiu-Jitsu. If you can find a good instructor for a good price near you, then by all means, roll with them - it is a great way to learn judo!