For example, here's a list of the best 40 players in the game. CA range 170 - 200.
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As you can see teams like Barcelona, Bayern, Real Madrid, Man City, Chelsea, Juventus are filed with 170 CA players.
For example, let's say you picked Hull and decided to bring world glory to this club and make it as strong as Barcelona or Real Madrid and in order to achieve that you need that CA of all your players were no less than 170.
As I already said "Star" ratings from the assistant manager is absolutely useless because he isn't capable properly evaluate which attributes are "truly" important for players and also he isn't able to give you at least "hint" about CA/PA level of the player because he evaluate/compare all players with players you have in the team.
For example, average CA of Hull's players is about 130CA and in this case every player with 140CA/PA will get about 4.5-5 "Stars" from the assistant manager... so when you buy 5 "Start" CA/PA player as Hull it doesn't mean that now you have such strong player as Barcelona or Real Madrid because if you would buy this player as Barcelona he would have only 1-2 "Starts" rating.
As you can see it's only you who can "correctly" evaluate the strength of the players and it really isn’t hard to do that... just need some practice.
So how do evaluate regens and tell how good their CA is ??
Home matches even vs better teams you should start with the BASE version.