I really don't see where this tag about being great one minute and woeful the next.....they are barely average.
West Brom apart their other victories, (Plymouth, Portsmouth & Coventry) have come against teams in and around them.
They have played 5 of the current top 6, losing 4 of them scoring 5 whilst conceding 16. They also lost 3-0 away to Millwall who had not won a game at that point and drew with Bristol City, QPR and Swansea.
If any other team was coming to BDTBL with that record we would be expecting a comfortable victory. As others have said, play the game, not the occasion and we win comfortably, let them worry about us, we play our normal game.