Yes, the OT can be very tedious to read. When I finally managed a complete reading of the Bible, I avoided bogging down only by switching between OT and NT books, because the tedium had worn me down on all my previous attempts.
I do get more from the NT. Part of that is the nature of the OT: it is a collection of literature, of many different types, accumulated over a very long time. And the whole Bible (both testaments, but especially the Old) is not so much a divine manifesto as a collection of excerpts from about a thousand years of arguments. When the NT corrects, refines, explains, or expands on material in the OT, it's representing a much later, and more developed, set of ideas about God and about what God wants of us.
This is often ignored by some Christians, who WANT it to be a divine manifesto, because that way they have a written basis for justifying themselves instead of depending on God. So they turn a blind eye to the obvious contradictions and changes in understanding.
Nevertheless, the OT is useful for understanding the source and development of the ideas in first-century Judaism and Christianity. For instance, we get the two Great Commandments (love God wholeheartedly, and love your neighbor as yourself) from Deuteronomy and Leviticus. And as a summary of the essence of the Torah, they were apparently known before Jesus: he actually gets an audience member--someone looking to pick an argument with him--to recite them in Luke 10.
The OT provides us with a great deal of important context for Jesus' teaching in the NT. But Jesus, like many OT writers themselves, uses it as a starting point for expounding his ideas. For instance, in the Sermon on the Mount in Matthew 5, he declares his intent to "fulfil" the law (that is, the Torah or "teaching"), and then cites a series of OT rules and extends and expands on them.