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My biggest gripe with this game (and most Japanese software does it) is that to restart a 4 hour race at 3:59:59 there's no confirmation prompt, yet to put a car in your garage that you won in a race takes four prompts.
It's absurd and unintelligent. No exaggeration: I restarted a B-spec 8-hour race in the last few minutes of the 7th hour by having my controller simply slide off the arm rest of my slippery leather recliner (the game wasn't paused and the cursor was over the driver command button). Another time I accidentally restarted the Miata 4-hour race at the 2-hour mark in A-spec. These among others, but this has happened to me more times than I can count on one hand, no matter how much I repeat "do not press 'X' to continue the race" to myself while paused.
This is pathetic software design, and in the UI Designer's world, strictly and completely and objectively wrong.
GT5 user interface may have nice aesthetics, but at it's core it's pure Japanese menu crap with obnoxious loading stalls between menu screens and terrible prompts that could have been handled better by a group of college interns from ITT Tech. Unfortunately, I could identify a few other aspects of the game's software design that are equally flawed.
I love GT5 when it's not restarting my races; but waiting for B-Spec Bob to go from level 35 to 40 by running the same 24-hour race 8 days in a row, having no new Seasonal Events this week, and not wanting to do the last few endurance races with the looming restart button, I ended up reading this board while waiting and discovering Forza. I had grabbed Forza 2 for $5 a while back, actually, but never played it until this board displayed such praise for it.
So GT5 may be a great game when you're in the cockpit driving, but the software is so bad and the last legs of the career so poorly managed that it literally led me to Forza... and I'm only on Forza 2, next is 3 and 4 is right around the corner... meanwhile GT5 has little left to offer unless I want to do the same endurance race over and over to get to the next level.
And, no, I don't have any interest in racing online with brats and griefers and cheaters.