Carlo Ancelotti isn't a tactically weak manager. Real Madrid's current situation has prevented him from making sound decisions. German midfielder Kroos retired, leaving him unable to find a suitable replacement. Furthermore, injuries in defense have crippled the team. This left the Italian manager with several options, and despite trying them, he unfortunately failed to win the title last year. It was actually a bit of an unlucky period for Ancelotti. New manager Xabi has a better and more diverse squad. He's also rejuvenated the squad. In this respect, there's a significant difference in the quality of the squad compared to Ancelotti's. I hope Real Madrid can succeed this year.
I disagree, for a long time, they just used "throw the ball ahead and let wingers run" style of football. Even on the season they won UCL previous year, look at what "tactic" they had, they didn't had nay decent ones, and that is why they ended up being bad.
We should not be all excited about this, and we can't consider this to be that great tactician for them. Sure on the last season he was also bad, but I would agree it wasn't his problem that they did bad then, because of injuries and many transfer issues, he wasn't playing with the best club he could be. But previous year, even with success, showed that, Real Madrid won possibly even against him, because they didn't had great play or formation or tactic at all.