I can't offer any help on the stove question (maybe search old threads for discussions about the particular likes/dislikes/concerns/advantages of the particular models?) but we've had a 36" Thermador fridge for the last five or six years and it's been excellent. Are there any particular features in the fridge or dishwasher, like shelf arrangments, door storage, how dishes fit, etc. that might influence which package works better for you?

When we remodeled our kitchen 13 years ago, we went for the Thermador package (36" range with free DW, 36" fridge with free hood). At the time I had never heard of the sentiment: "yuck...too matchy-matchy." In any case, I liked that the handles on the oven, DW and fridge match, and that the stainless steel all has the same grain/sheen, but I didn't specifically buy it because they matched, but rather, the bundle deal allowed me to have the range that I wanted. Frankly, I love all four pieces. The only problem we have had is that we had to have a repair on the ice maker. No issues with range, hood, or DW in 13.5 years. The units all look like they did on installation, except for the "star" burners on the most-used burners are now gray instead of black; doesn't bother me, I use a stainless cleaner that shines everything up like new. Also, a few years after we remodeled, I read some reviews of Thermador that were pretty negative (Sub-Zero and Wolf reviews were often bad, too), but the fact that I have had no issues is good enough for me. Good luck with your decision. Can't help with Blue Star.

The salesman is most likely getting a nice commission from Thermador which is why he's pushing it. Get what you love.

My sister is just ok with her Thermador cooktop but hates her Thermador dishwasher. My other sister had a Thermador fridge and ovens and was very happy with them.

Get what you really want. A salesman is…a salesman.