Since he moved to Liverpool, the 32-year-old has had a difficult time.
Not because of anything to do with the Reds, of course, but because of Lambert's frustrating experience in Brazil.
To see his England side get knocked out of the group stages after just two games must have been hard enough for the former Southampton striker - but to do it without much playing time must have pained him even more from a personal perspective.
Even in today's clash against Costa Rica, Lambert will again have to settle for a place on the bench as Liverpool team-mate Daniel Sturridge starts for the Three Lions once again.
It is no surprise, then, that the 32-year-old has labelled this World Cup a 'ruthless' experience.
"It's ruthless, it's absolutely ruthless," Lambert told FIFA.com. "It's something that I've never experienced before in my life, I've played in a lot of games but I've never played in a tournament.
"It's hard to forget about and start looking to the future; it's going to take time to get over what's happened. When it does die down, when it does clear a little bit, then I think we can take positives."
And taking the positives will be key for Lambert if he is to bounce back from such an unforgiving summer.
For the first time in his career, the experienced striker will be playing Champions League football - a chance not many get for the first time past their 30s.
Meanwhile, coming off the bench late on might be a feeling Lambert will have to get used to during bigger games at Anfield. Liverpool, too, are getting over their own recent disappointments.
So however hard the World Cup has hit Lambert - and the rest of the England players - the only way is up. The frontman shouldn't forget that he scored for his country in their build-up to the tournament and that he has just had one of the seasons of his life at club level.
Lambert, along with Steven Gerrard, Jordan Henderson, Glen Johnson, Raheem Sterling and Sturridge will be needed from the off when they return to training with the Reds. Hopefully, they'll only have learnt from this summer's gruelling experience.