Merson suggested that the Hammers would finish in 14th place in the Premier League this season, with the likes of Stoke City and Aston Villa tipped to finish ahead of them.
The former Arsenal midfielder clearly did not think that Slaven Bilic's arrival would make too much of an impact, but he looks set to be proved very wrong by the Croatian.
One thing Merson did call more accurately, is how West Ham's form would fluctuate over the course of the campaign.
"When West Ham are not expected to win, they turn it on and when they have home games against teams that are going to be in the bottom half they get beat - so that needs to change," he said back in September. "The fans need to be a little bit more patient at home. Away from home, the shackles can come off."
West Ham's only two losses so far this term have come at home to Bournemouth and Leicester City, while they also struggled against Norwich City.
Indeed, it has been the Hammers' away form which has provided the basis of their success, as Merson suggested.
Bilic has got the Hammers attacking with pace and power, and they have caused problems for some of the Premier League's biggest clubs.
West Ham have already beaten Manchester City, Liverpool and Arsenal away from home, as they have made a hugely impressive start to the new season.
The London club are currently sitting in sixth place in the Premier League table, and they are just one point away from the Champions League spots.
Although much could still happen between now and May, it would have to be a spectacular collapse for the side to drop all the way down to 14th, and it seems that West Ham could be set to considerably surpass Merson's expectations of them.