I have started following the NBA since about 2011. Thus these are all players I have seen play from the modern game. The top 10 consists of players who I like so much that I find it hard to root against even if they play the Celtics:
1. Stephen Curry (I watched almost every Golden State game during his MVP-years, what a treat)
2. Nikola Jokic (an alltime great, regularly he makes insane plays look so easy)
3. Manu Ginobili (underrated in my opinion, very intelligent player which I like)
4. Andrei Kirilenko (I wish I had seen more of him)
5. Tim Duncan (great attitude and presence and so solid even at age)
6. Brook Lopez (great post player and became a superb defender, doesn't get enough recognition)
7. Tyrese Haliburton (a true point guard and team player)
8. Jonathan Isaac (his long injuries unfortunately prevented him from reaching his ceiling)
9. Donovan Mitchell (when he's on fire he's one of the scariest shotmakers under pressure ever)
10. Alex Caruso (everybody likes him and he should be a Celtic some day)
To complete my top 25 of non-Celtic players of all-time:
Damian Lillard, Derrick Rose, Mike Conley, De'Aaron Fox, Shaun Livingston, Devin Booker, OG Anunoby, Amen Thompson, Kyle Anderson, Paolo Banchero, Thaddeus Young, Kevin Love, Pau Gasol, Joakim Noah and Rudy Gobert.