I've had varying experiences with the colorado weather - even on I-70, been in a minivan sliding through a symphony of cars bouncing off each other and the walls of the freeway in Denver earlier this year. Fortunately we avoided all the other cars smacking into each other and arrived at our destination unscathed.
Also - on another trip, the compact FWD rental car didn't hack Loveland Pass too well... that road is an icy hell - we were sliding all over the place at extremely slowwww speeds. (Also - some skiers were pissed that we didn't pick them up on their hitchhiking journey from Loveland to A-basin... Not sure what that was all about o_O).
Either way - skipping Loveland pass == smart in my book.