So what races would you kind of advise against taking up for the moment?
Beastmen seem obvious, Dwarves unless it changed real recently I kept seeing are still in placeholder-y states, any other particularly noteworthy ones though?
Anyone in the Chaos Wastes because they are hell.
If you like to blob don't go for anything in Lustria except the Generalless if you want a really really really really brutal challenge.
Elves of all variety are also somewhat anti-bloby. Well the Druchii can be bloby if played a certain way so they are the exception.
Vampires of all varieties are awesome to play as although the Lahmians have some clunky mechanics. Ignore the clunky mechanics though and conquer the world with free troops and cash. I am in no way biased towards Lahmians because they are my longest game in CK2 ever. Nope not at all.
Green skins are fun but I have an annoying tendency to have all my heirs being killed by me and then dying and the game ending much to my frustration.
Empire and Norscans are fun to play as in a more traditional sense.
Haven't tried Araby, Bretonnia, Kislev, or Cathay colony so no real clue on those.
That one tribe of night goblins starts as a shaman with no nearby orks. So if you get a bunch of money from raiding which you should totaly do you can build some magical gear which is really really helpful in duels. Duels happen a lot as a green skin so this is a massive boon. It adds for an interesting goblin play position if you feel like trying them ever which isn't super recommended because your troops are awful. Still is fun though.
That is my random blabbing on play excitement I have had.