In all your sets that you have posted, one common thing that bugs me are the harsh shadows which aren't pleasing in architecture photos (well, not usually).
Picture #2 is a good example of this as there are some really really bright spots and some really dark spots. And also a leafy over hang that i don't like.
Try and focus on shooting where there are no shadows, whether its going on a different time of day or finding different angles. I often walk by places and note them down to return a few days later at a different time of day.
Photography is rarely about just walking up to something interesting, finding an angle, shooting, and walking off.
I completely agree with everything you have all said. I knew when I got there that it was already too late in the morning. I stopped over at my parents house to charge up my battery (oops) and when I left I uttered that very sentence "I've got to go, the light is probably already to harsh" But using the time that I can get. I did also struggle with the tilting. will work on that. Thanks!