Not that I'm a Jap fan or am in love with my Accord (well it does have 2 exhaust pipes so you can't really blame me) but the interior isn't that bad and to me it doesn't feel flimsy. When I got my Type-S, was an ex-demo back in 2004, I had a look at quite a few cars for some sick reason I quite liked the interior and still do.
To answer the OPs question(s) the economy is nothing to shout about, I get around 26-28mpg on average, servicing the car if done at a Honda dealer isn't particularly cheap (from what I've read here a 3 series is cheaper to service) and I've had no problems with my car. It does eat through tyres and brake pads but that's probably more related to the way I drive and if pushed hard does suffer from heavy under steer. If I was honest boot access isn't that great but it does have folding rear seats for those long squat moments.
Pretty much how I feel about mine and posted pretty much the same. Dealer servicing is a total rip, I never paid for it, and had a local garage service mine...
I've had nothing major go wrong with my 2.4 Type S either. Tire wear on the front is poor at times, but again could be down to my driving, brake pads wear down quickly as well on mine too..
some honda Accords from 03 - 05 had a headlight fault, it got water into the lens and wouldn't drain out. It was fixed for free, mine was fixed for free but not all suffered with it.
boot access is poor as mentioned. And as for the interior, is not too bad. Mine has been fine, its well built, feels solid and apart from my stereo being a bit up and down with the volume control (its odd, radio doesn't keep a constant volume level anymore) and the lack of backlit controls on the steering wheel (stupid idea, can't see them in the dark) the car is actually pretty good..