I disagree to this,Forza games uses exactly the same technique as GT does, recycle old assets
Granted, Forza does recycle old assets as well. There are two major differences, though:
1) The visual differences are not nearly as noticible as they are in GT5.
2) All the old assets have all features available, they're not limited in any way.
Regarding the development time:
Even if Forza recycles stuff from even Forza 1, that game was released in 2005. Gran Turismo 4 was released in 2004, GT3 in 2001, even. Now, even if we consider only GT4, that gives PD still more total time than T10. Add to that that the recycling isn't as noticble in Forza, and that's why I'm considering T10 to have better time management.
As far as the individual development time goes, GT5 had more than Forza 3, recycling or not. As I said earlier, Forza is on a two year development cycle. GT5 had at least twice that much time. And as far as QA and polish of the single game goes, think Forza 3 is far ahead in that regard. It dramatically shows when playing GT Life. It feels as if nobody at PD ever bothered to actually play through GT Life, for example.
Regarding the features:
GT5 may have added more features compared to the previous game than FM3 did. However, if you look at the feature list, they're both not actually short. it's just that, in my opnion, GT5 had to close the gap that has opened itself since GT4. Forza released three games during that time, thus, if you look at what the franchises added in the same period of time, I can't see how Forza would be lacking in that regard.
If a franchise has to close such a gap with just one game, it just has to add a huge load of features in that game, compared to its predecessor.
Granted, neither game is where I, personally, want it to be yet. And both games could improve themselves a lot if they just looked at each other and copied the good stuff the other game brings to the table.
Thing is, this is something that I kinda think T10 is more willing to do then PD. Maybe due to the fact that it's easier to copy the good stoff from the competition, but I honestly don't care.
Now, in 2010, both games added a lot to the console sim racing genre since 2004. Both games have a different focus right now, but I'm quite certain we'll see a step forward by the end of next year.
We'll have another debate about Froza 4 and GT5 and I for one am looking forward to how those games will compare. A patched and updated GT5 versus a fresh Forza.