No, not necessarily. They may be so bland as to please nobody. (This was the case for an old rural progressive party in my country for many years). Or, they may be neutral by default on most left-right issues because they really care about something mostly orthogonal to it. This has been the case for the Christian Democrats and to a lesser degree the Farmer's party in my country.

The paradox is that they get a good deal of power being pivotal, but only on issues they don't really care so much about.