A few I had in the past that I didn't care for:
Pioneer CS-99: Incoherent sound overall, virtually no bass from the 15" woofer. This was the circa-1969 version, not the later CS-99A
Wharfedale W60: DULLLLLLLLLL
Jensen TF-4: A shallow bookcase speaker from about 1964, with five drivers total (10" woofer, 8" midrange, two 3" tweeters, and a "sonodome" super tweeter). Severe one-note bass problem, highs nearly non existent. The "Sonodomes" either were failed or they just didn't put out any sound I could detect. Easily the worst one on this list.
Infinity SM-112: Very bass-shy given its largish woofer, unnatural razor sharp piercing highs that cut your ears to ribbons
Cerwin-Vega AT-15: Boom Boom Tizz Tizz. Great party music speaker.
I agree with comments further above about Vandersteen 2C (Ci, etc). I have the 2C version here now; they do deep bass and that's about it. Dynamics are slow, stick in the mud variety. Takes a lot of amplifier power to drive them.