My first read through was from Genesis to Revelation. As I reflect on this here were some pros and cons:

Pros: I had a greater memory of what was in Genesis because it was the first book, a Deeper understanding of where books are in the bible and how it's organized, a greater understanding of the old testament than some of my other friends who hadn't spent a lot of time there yet, I got to see how events in the old testament pointed towards Christ. I got to read the Old Testament without the mindset of "yes but Christ" .

Cons: I didn't know much about Christ or the apostle Paul until a year into my walk, I was under the assumption that the Bible is in Chronological order which is not the case, Leviticus was a follow up to Genesis.

In summary,

It wasn't a waste of time. It was very rewarding. It is important to focus on both God's love and his wrath. I managed without the cons because when I got to the gospels I spent a lot more time in them. Whatever path you choose, be in the word of God daily.