bots need more skill they are god with awps but they dont get headshots everytime and miss some stuff like if your head is poked out behind a crate they will run right by
e.g. If I got 5-on-5 with Expert bots, the bots on each side are experts. You cannot make your team Medium and the opposite team Experts.
This means whenever you have bots on your team they are just as good as the other side--so as you make the opponents harder your teammates are just as good and kind of cancel this out.
The solution I have found for this is to increase the odds. Playing 12-on-6 on Expert could make for a quality challenge. And it is more realistic because how often in real CS:S do your teammates stick with you? Whenever you go for objectives your teammates are rarely helping!
Btw, 3 humans on 9 hard bots is a pretty nice challenge on dust2. If they win a couple you cannot get very good guns to protect the Bomb as a terrorist. Had a lot of fun doing that!