#1 hate is I can't open images or pages in new tabs, if I tap and hold on the outer thumb I just get the option to save that thumb, if I tap and hold on the link in the preview I get nothing at all. That makes browsing multiple images painful.
#2 is to view the meta data that's "free" on normal GI you have to click through to the preview and start downloading it and other images at a larger size. Images has lots of shitty, spammy websites gaming the results as well as poor versions of images available elsewhere larger, seeing that info was always useful to me.