The Rossi BC line gets pooped on a lot on this site- I am not quite sure why...
(EDIT: I myself have made all kinds of negative assumptions about these skis- entirely based on my experiences (many years ago) with the narrow, stiff, cambered XC-focused models- not really fair of me to do so- they might suit other skiers perfectly!

I am thinking it might be a legacy of older models?
The older Rossi BC65/70 are stiff, short, double-cambered, have cheap bases and a very poor slippery waxless scale design.
For a while there was a "BC90" that seemed almost identical to the waspy, stif, double-cambered Fischer Rebound/Atomic Rainier (~90-60-80). (I know that some skiers loved the Rebound/Rainier (I am not one of them) so I am not sure why people hated this BC90...)
The most recent outgoing BC90 seems to be identical to a current Fischer Excursion 88 (without Fischer's Off-Track Crown insert). People love the 88- why the hate for the BC90? My friend has this version of the BC90 and skis in lowland, Nova Scotia with its mild temperate winter- he loves this ski for BC Nordic touring on wet snow.
The outgoing BC110 is- from what I can tell-measure- a Fischer S-Bound 112- without the Off-track Crown insert. Again- people seem to love the S-112- why the hate for the BC110?
Is it the crappy base?
The current BC 80/100 are totally different than the outgoing BC90. They are very light, less cambered than the Fischer 78/88 and lack the resistance of what I would call a "camber-and-a-half" ski-
They are less cambered than a Madhshus Eon- they have a smilar flex to a Madshus Eon- and I think that the Eon has more tension underfoot. The base quality and scales are really no different and I don't see how the old Karhu Omnitrack is really any better than the scales on the current Rossi BCs...
For those looking for an inexpensive light-duty Nordic BC touring ski for gentle to rolling terrain- and don't need/don't want/can't afford a high-performance ski- I cannot see why one would not consider the current BC 80/100...
The current BC120 is another ski altogether- I seriously considered buying this ski on clearance for a mere $180CAN last summer...
The recent SkiEssential video that was posted clearly shows that the BC120 has a purely downhill geometry- with a "hybrid rocker" (i.e. rockered tip, single alpine camber, flat tail)- it looks like a Voile Objective to me...
Check out these specs:
Voile Objective 178cm:
117-84-102mm
2.27kg
19.5m radius
hybrid rocker
- no reinforced binding zone
Rossignol BC 120 176cm:
120-86-108mm
2.25kg
20m radius
hybrid rocker
- reinforced binding zone
Isn't the Rossi BC 120 a "poor man's" Objective?