McLaren are on course to enjoy success this season. That may seem hard to take in, but in my opinion they are on track. It is obvious the car may have some reliability issues, but the car is not far off being quick, with Honda planning radical changes after the August break.
Alonso's car qualified with a time of one minute and ten seconds this season, whilst he set a one minute nine and a half seconds qualifying time in 2014 at Ferrari.
So, Honda's engine (as we already knew) is a year behind. Honda are the company for the job when it comes to development, with them inventing new technologies, even when they don't need to (ASIMO project) and also putting the finishing touches on the hottest of the hot hatches (the new Civic Type-R).
Couple that with the fact that McLaren have almost always been generating new ideas (think of the 'F-duct' - the device which became the DRS, and they were the first to use a carbon fibre monocoque) and development will be swift.
Even if they are not up fighting for titles, they will at least be scoring points most races come the end of the season.
If you still need convincing that the McLaren Honda partnerships is going to work, look at the drivers - both world champions who provide the best kind of telemetry back to the Woking-based team and their Japanese counter-parts.