A red blend is often the way to go when looking for a very drinkable wine. They are not as extreme as most of the specific wine types. They are specifically created to be a drinking wine and not offensive.
In the same sense you will not know what kind of flavors to expect from a red blend. They do not conform to any preconceived idea of what the wine should be so these wines can be a hit of miss, but honestly all wines are a hit or miss.
In my experience the red blends are generally very good wines.