Jenson Button thinks the rest of the field are letting Formula One down by failing to challenge Mercedes for the third season in a row.
Mercedes looks locked in for a third straight constructors' crown, while the drivers' championship is once again a two-horse race between Lewis Hamilton and Nico Rosberg. The German manufacturer has dominated F1 since the introduction of the V6 turbos - it has won 43 of the 50 races since the start of 2014.
Button believes the rest of the field have simply not done a good enough job.
When asked about the Hamilton-Rosberg title fight, the McLaren driver replied: "It's a not a fight we're involved with. It's not a fight that really makes any difference to me whatsoever -- who wins or who doesn't win. For me, the important thing is we get other teams involved fighting at the front, because having just two guys in the same car fighting at the front is not what the sport needs.
"It needs other manufacturers involved, other teams involved, and that's where we're letting the sport down by not doing a good enough job. Races like Barcelona when Mercedes weren't in the race [after crashing out], everyone loved it because there were four cars fighting for the win.
"That's something we hadn't had for three years, so hopefully we'll have more of that in the future of Formula One."
Regulation changes next year will move the onus back towards aerodynamics, with wider and more aggressive-looking cars. Much has been made of the strength of Mercedes' engine but Button thinks it is wrong to assume that is the only reason the world champions are doing so well.
"In terms of why they're so good? I don't know. I think if we all knew, we'd be as good as them. They have a lot of very talented people, and maybe the [current] regulations are in their favour.
"For next year, could they be caught out? Maybe. Possibly. But then I don't really think their power unit is that superior compared to the Ferrari, for example. They just have a very good car. Their overall package is fantastic.
"I don't think you can just point at the engine and say, 'that's why they're performing well', because there are lots of other cars with the same engine that aren't performing anywhere near as well."