Depends on the signs- as well as what the other placements are. As a Capricorn Sun, I have been with 4 capricorns. The first one was full or adventure, the second was all about controlling me, the third one was near perfection but cut short by way of death, and the fourth and current is no way boring or dull.
I was with an Aries- that was OK, Leo-fun, Aquarius- yawn....and annoying. Libra- boring.
Those were not all marriages, just relationships.
The true test to find if a relationship between any two people regardless of signs is to do a composite chart for the relationship. Based on the placements in the composite chart, it will show the dynamics of the relationship.