Though I'd disassociate this topic from Cees' wonderful topic about the amazing tape stripe job his wife did on the Bronco II.
I said that the first 3-series took BMW "from a small boutique manufacturer of funny looking cars to a world-class manufacturer of highly desirable performance cars and luxury cars."
Now you may interpret anything you like, or have your own subjective views on the matter but keep in mind some facts.
BMW did not have its first dealer in the USA until 1975. Until then, in the USA, its models were sold as merely add-ons to existing dealerships of other marques. You can't be a big player without a dealer network, and even that first dealership in 1975 didn't make a "network". You need to support your dealer network with advertising, co-op dollars, sales and service training, a complete parts and service supply chain and more. So even the first dealership doth not a network make. That evolved starting with that first dealer in 1975.
Yes, in the early 1970s BMW did sell the "Neue Klasse" as they called it, which was the cars starting with the 1500 in 1962 and ending with the 2000 in 1972. Then came the 02 series, based on the former but starting with the 1600 in 1966 and ending with the 2002 in 1977. While they made 377K units of the 2002 model from 1968-1975, things really began to move for BMW with that E21 intro. More than 1.3M units were made. Yes, they became a player.
It's important to remember also, that during the years of the Neue Klasse and the 02 series, they did make some other cars. My favorite is the 3.0CSi. But those other cars they made at the time were all very low unit volume. In fact these models of which the 3.0 was part of, the E9s, total volume was around 30K units from 1968-1975, across some 15 distinct models. Yes, that's low volume.
When that E21 was released to the USA in 1977, they also had the 5-series E12, (also a Bracq design) the 6-series E24 (yet again a Bracq design) and the 7-series E23. I don't believe this latter E23 was a Bracq style, but he did a 7-series during his tenure right around the time of the 1973 oil crisis and I believe that car was shelved. I don't know how the original design related to that produced later.
Thus, by the late 1970s, BMW had a reasonably complete line of luxury and sporting cars for the USA market and even more worldwide. So they did indeed move from a smaller manufacturer (I say boutique) to a larger one.
I also said "funny looking cars". Can anyone actually LOOK at a BMW Isetta, and not laugh? While not their own design per se they did plenty of work on it, "taking ownership" as it were and "making it their own". It's a funny looking car. The BMW 2002 and its predecessors and peers in the 02 and earlier series were boxy cars that had a polarizing styling. The 3, 5, 6, 7 series all went away from that boxy polarizing style to one that had more appeal. Swoopy, curvy, beautiful...but not the jellybeans that everyone is making now.
I loved my 320i. It met an unfortunate demise in a fire due to an incorrectly sized battery being installed by Sears. I had made arrangements to sell my well-kept car, and was getting it ready for sale when it burned up. A very sad day--I had that car for 10 years and 100,000 miles as a daily driver and enjoyed every mile.
Speaking of polarizing, my daily driver is a Ford Flex. Those with a long memory may remember the press on that one when it came out; a refrigerator on its side, box on wheels, etc. Nothing really complimentary was ever said about its styling, perhaps the epitome of polarizing style. But its packed full of function and utility, and a fabulous car for long road trips and for hauling. When I'm driving it and using it, it's polarizing style is only for those outside the car. I'm behind the wheel! Sadly this one I have is the last.