I just get the impression people in Russia think he's been cack this season.
I haven't watched a single CSKA match in this new season in Russia, so I can't argue against that, but the season started less than 3 months ago and they played only 10 rounds so far, so maybe we can find some excuses for that:
1. When the Russian season started on March 12, CSKA were 100% concentrated somewhere else, in the CL.
On March 16th they played the return match away to Sevilla in the first knock-out round, which they won, and on March 31st/April 6th they played the CL quarterfinals. In the meantime 5 rounds in the Russian league were already played and I doubt the CSKA players had much interest in those 5 matches.
2. Krasic probably knew he's already leaving CSKA, so that made him less motivated.
3. The World Cup.
So knowing that he's leaving and that the world cup is behind the corner, I guess he's been more careful not to get injured or something. All the 3 reasons mentioned above, combined, might explain why he's playing bad at club level in these last 10 matches.