I was happy that, despite all the gaffes, the Bills' starters beat the Browns' starters last weekend. And while you might be tempted to say "well it IS the Browns," they were 6-10 last year in a tough division (had the Bungles who had a 1st round bye, the Steelers who won the SB and who along with Baltimore were tied for the 2nd best defense in yards per play). They also cut a lot of bums and added some good players over the off-season, not to mention they got back Edwards and Winslow Jr.
I too will consider it a successful pre-season if there are no injuries.