When you said good at regular season but maybe not so much on playoffs, I remember raptors before last season. They have always played amazingly during the regular season, they even became the eastern conference leaders for a season if I am not wrong, then every year Lebron just beat them and went to finals. They became the champions as soon as Lebron left the conference
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But when Lebron left the East, they become more competitive, they even win the championship, but unfortunately, they faced an injured team where 2 of their best players (durant and Thompson) did not completely play the entire series, so we can also say that the Raptors were lucky that time.
Now, Leonard the man who brought the team and give a championship joined the Clippers, so probably if the Bucks would have an easy journey, they might again struggle facing whoever wins in the West.
So, bucks could be like that, they could be good, or they could have hard time. Last year they were great and played well on regular season but lost during playoffs but remember they lost to eventual champions as well, so that means they are not bad at all, this year they are more practiced with the system they have built and I think they might actually have a chance with Kawhi out of their way as well.
The team to beat by the Bucks in the East are the Raptors, Celtics, and the Sixers, but I like them to face the Sixers in the East Finals and I think Sixers will have a good chance of beating them as they have a lot of players that can defend the Giannis since he is the only one that has to be stop to shut down the system.