I tried getting into fleet-heavy sci-fi, but I need strong characters to anchor me. That's why I ended up loving the 'Vorkosigan Saga' by Lois McMaster Bujold. While not every book is fleet-centric, when Miles commands a fleet, it's a thing of beauty. His tactics are all about misdirection, audacity, and using his physical limitations and enemy assumptions against them.
In 'The Vor Game' and especially 'Captain Vorpatril's Alliance' (from a different angle), the space tactics are brilliant precisely because they're character-driven. You follow the clever plan because you're following a clever, desperate person.