If Kafka was trying to replicate the experience of bureaucratic Hell that the protagonist, Josef K., was enduring throughout this book then he did a great job because this was almost as difficult to read and enjoy as the trial itself was for K. 
 I'm sure you could fill an encyclopedia discussing the various layers and symbolism in a Kafka novel e.g. the various paintings of judges, the role of the various loose and desperate female characters, but that doesn't, for me at least, make this book any more enjoyable to read. 
 It seems Kafka was entirely dedicated to trying to convey his ideas and themes but did so at the cost of the work actually being enjoyable or engaging. With such a thin story, bare-bones prose style, and repetitive dialogue that takes an entire paragraph to say essentially nothing, there is little attraction in the writing itself to help hold my interest. There are flashes of dark and bazaar humour but it's always sandwiched between protracted descriptions of inane non-events and subsequently drowned out. 
 I'm sure Kafka was very deliberate in how he chose to tell this story, but it's one thing to talk about the mundane and repetitive grind of life and another thing entirely to actually write a story that makes me care about the philosophical points being raised. Without some kind of fleshed out, sympathetic character, without some kind of engaging story, all this amounts to is standing on some barren middle-ground between a lecture and a parable. The point (for me) of story-telling and art in general is to achieve some kind of empathy. In order to achieve that I need more than monotonous detail and symbolism, no matter how clever or rich it may be. 
 On the other hand, if you approach The Trial from a largely philosophical stand-point then there's probably a bit more for you in terms of the nuances of Kafka's discussion on bureaucracy, nihilism, society and their broader application to life. It feels like that was the type of audience Kafka's writing was intended for. I clearly don't count myself among that group, at least not to the extent that I could feel satisfied with the writing or story. 
 It really didn't help that the edition I read (Dover Thrift, 2009) had the dialogue embedded into the paragraphs. I can understand doing this if the story or narration actually lent itself to such an idiosyncratic, stylised format, but the book is largely formal and otherwise conventional in style so it simply made the book even more tedious. 
 After reading The Trial and a collection of Kafka's short stories including Metamorphosis and the incredibly painful The Burrow I think I've gotten a fair idea of his overall style and can see it's not for me.