It takes a while for a series to get good, to reach a level where you can't wait for the next book. It all varies, of course, depending on who you ask. Discworld doesn't kick off until the third books, Equal Rites, Dresden Files hits a home run also with the third book (IMHO), Grave Peril.
I'd really enjoyed Benedict Jacka's Inheritance of Magic series, and binged the first three books. Then, I was caught up. But I'd heard nice things about his earlier series, so I've been going through them. The first book was fine, but nothing 'grabby', but then book four! Amazing. Everything took off!
To summarize, Alex Verus is a mage in a more kitchen-sink urban fantasy universe rather than the An Inheritance of Magic series. A bit like Star Wars, there are Light mages and Dark mages, and hints of a time when mages ruled the world. The magic system is a bit more fluid, where everyone has an aspect like light, time, earth, water and so forth that they can manipulate for various effects. Alex is a diviner, so can sort through the futures and pick the best one, a bit like what Doctor Strange did at the end of Endgame to pick the best future.
Alex has a dark past - he was an apprentice of the Dark mage, Richard Drakh. But he left the Dark side, and now acts as a neutral mage, doing side jobs for the Council of Light wizards. One of the great things about a series is that you can see a character develop over time. Alex starts off as a standoffish loner, a bit arrogant and rude to his summoned elemental, and to his only friend, a young woman called Luna that hangs around Alex's magic shop, as she's cursed, lonely and desperate to learn more about the magic world. (Her curse is like Rogue's from X-Men, where she can't touch or get close to people otherwise they die.)
Over the first four books, Alex transitions from this loner figure to a mentor to young mages around him. He takes Luna on as his formal apprentice and helps people trapped between good and evil. That he has friends and someone to fight for really makes the fourth book hit home, when an old enemy from Alex’s past wants revenge, endangering all the relationships that Alex has built up across the series.
This book also digs into Alex’s past with his abusive mentor, Richard, and his relationship with the other apprentices. Like a Sith, there can only be one! Except from Alex’s group, a young woman, Delio, survived and hates Alex for getting away from the lifestyle. Book four ends with Alex in a terrible state: to survive against his enemies, he’s had to sacrifice his friendships. He’s had to promise to redeem Delio, and worse, his old mentor is coming back... This is a great set-up for the rest of the books in the series. And now I’ve got all the rest on order.