Too many cats, too many wolves and too many bucks being taken during the rut.
They need to get way more liberal on the cat season, IMO they won't be able to take enough cats to make a dent in them. Same with wolves....
As for quality deer, unless one has a very limited entry permit and or are hunting extremely controlled private land then it's going to be very tough to find a main frame 150 Whitey or a 160 main frame muley.
IMO they need to look at the idea of shutting the buck hunting down on November 15th. That would give people a few days of the rut but not 2-3 weeks of it. They could allow for a few rut permits in a lot of the units. This would help with the age of bucks available.
As well, it would be nice to see people stop shooting young and immature bucks. Take a doe and or buy more beef and chicken. If we could slow down the attitude of I bought a tag so I have to shoot something things would come a long ways in 3 or 4 years.
Montana could have some really good buck hunting but it would take work, sacrifice and commitment by hunters, fwp and landowners.