Without wanting to get embroiled in a my dad's bigger than your dad argument, I'll have a go at answering some of your points.
There reason it's built like it is, is all down to getting planning permission and the amout of local opposition from the local green lobby, NIMBYS in the neighbouring village and the Lib Dem council of the neighbouring Lewis district council where the coach park is built on. Bearing in mind the planning application first went in in 2001 you can see how close we were to the place not being built. To get round some of this opposition they had to design it to sink into the land and the hill which it sits on, hence the lopsided look. They also had to limit it to 22,000 seats, part of the opposition argument was that we didn't need a stadium that size given our attendences at withdean and gillingham. The club management and architects actually pulled off a masterstroke when they left the gaps in the corners and opposite the main stand, nobody realised at the time that they'd actually built a 30,000 seat stadium and filled it with 22,500 seats. Thre are no brownfield sites in Brighton at all, it really was this or nothing. It looks wierd inside, but better to look wierd now with ability for the club to grow in the future.
The cost of £90 mill includes everything from legal costs to money spent on local infastructure. It also cost alot to excavate the millions of tonnes of chalk from what used to be the hill where the stadium sits now. Apparently just the stadium part was more like £60 mill. None of the money is from bank loans, it was supposed to be but all the banks were going bust when they were finding money, hence the whole lot coming from Tony Bloom's back pocket.
Transport isn't as bad as people are making out. I normally stay for a pint after the game and then walk straight onto a train, but when I have left on the whistle the most I've queued for was 40 minutes after the Liverpool game which admittedly was a shambles. It is getting better.
Some of the comments comparing it to Colchester or MK Dons are laughable. Had you smashed us 0-3 like you were supposed to I'm sure you wouldn't be quite as harsh.