Five things we learned from West Ham United's win over Manchester City

West Ham United's excellent start to the season continued this afternoon with a 2-1 win over Manchester City at Upton Park.

Enner Valencia is far from a World Cup wonder

Despite such an impressive World Cup, many fans and pundits were concerned that former Pachuca winger Valencia would struggle in England after a £12m move from Mexico. However, he's proving the doubters wrong after another impressive display today. Valencia was full of running and caused Vincent Kompany no end of problems with his pace, especially when he laid on the pass for Morgan Amalfitano's opening goal.

West Ham took a chance on Alex Song - and are being rewarded

Having struggled to break into the Barcelona side in recent seasons, the Catalan giants were desperate to let Song leave the club. A number of English sides were linked with a move to sign the former Arsenal midfielder, but West Ham were the only side truly willing to take a chance on the Cameroon international after his petulance at the World Cup this summer. So far, they're being repaid. Song was outstanding today, breaking down play in front of the back four and playing a superb pass for Amalfitano's goal.

Sam Allardyce landed one of the bargains of the season

Whilst Valencia impressed with his pace and running, Diafra Sakho remains the star of the show in attack. The Senegalese international joined West Ham from French side Metz in a £3.5m deal this summer, and today's winning goal means he's now scored seven goals in seven starts for the Hammers. Only Chelsea's Diego Costa has a better goals-to-game ratio in the Premier League, and Allardyce must be ecstatic to have landed such a bargain.

Allardyce deserves praise for overhauling the Hammers' style

West Ham were poor last season, finishing in 13th place and just seven points above the drop zone. That brought demands from the West Ham board, who wanted Allardyce to introduce a new style of football at Upton Park - which seemed almost impossible given Allardyce's almost patented long ball tactics. However, this West Ham look bright, energetic and pacey, particularly in attack, and after beating both Liverpool and Manchester City at Upton Park, Allardyce deserves all the plaudits.

Top eight is a realistic aim based on this display

Finishing in the top ten had to be the aim for West Ham this season after a strong transfer window, but recent results mean that fans have to be dreaming of an even higher finish - and they are right to. Five wins from the first nine games leave the Hammers in fourth place, and whilst a top four finish is massively unlikely, top eight should certainly be in their sights if they can keep beating the top sides at home.

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