For me, training camp is simply one of the best times of year, period. I have counted down the days to training camp for the better part of 25 years now, and not much gets me as excited as a sports fan.
I feel like a lot can be gleaned from watching camp practices and pre-season games, but you have to know what matters and what doesn't. What translates to the games that count and what does not. For the most part, we know the players that have been playing for a few years, so really it is the younger guys that have my attention. They are the great unknown about which the pre-season can tell a lot.
If a WR in a pre-season game gets wide open and catches a long pass for a TD, that really doesn't mean that much because the opposing defense might have scrubs playing in the secondary and/or rushing the passer. Plus you can bet that the defensive coordinator didn't put any time into defending what your offense would be doing that day. What does matter though, and what will carry over is; did the WR run a nice, crisp route? Did he catch it smoothly or did he double clutch the ball before bringing it in? Was the throw on time and hit the WR in stride or did he have to slow down and wait for the ball? How did the OL look in their one-on-one battles against the DL? Did an offensive lineman gets beat by his man straight up or was there a stunt that got his guy free?
All of that stuff matters. If the WR ran a crisp route, that says good things about his coaching and how he is picking up the fundamentals of the position. If the WR catches it cleanly then it says he has pretty good hands and isn't an Alexander Wright that can run but not catch very well. If the throw hits him in stride, then it says that the QB and WR are in sync and their timing is coming along nicely.
If an OL wins his one-on-one battle at the line of scrimmage, it bodes well for his athleticism and ability. However, if the defense runs a stunt and gets the DL free to the QB, you can't take much away from that because the OL didn't prepare for the stunts or zone blitzes like they would in a regular season game.
I always hate to see missed tackles because that says a lot about the teams fundamentals and the coaching. Good, solid tackling throughout the pre-season is usually followed by good, solid tacking in season. I think this is like what @
TwoDeep3 was alluding to. He also talked about penalties in the pre-season games being a indicator of similar problems when the games count... which I agree with.
In the training camp practices and pre-season games, the fans can learn a lot about what the coaches have in mind. Who is starting, who is coming in on the second team, and who comes in with the scrubs. I have always been able to get a good idea of which UDFA's are making an impression and which are not simply based on if they climb the depth chard from the first preseason game to the last one. A player like Cole Beasley who got more and more playing time as camp goes along, and played earlier and earlier in the PS Games.
To be sure, there is a whole lot that doesn't translate over to the regular season... but if you pay attention to the right things, you can watch little known players grow and earn their way onto the 53 man roster. If one of your pet cats is Bishop or Dixon, it will become pretty clear, pretty quickly if he is making a good impression and has a chance or if he isn't what we hoped for and he doesn't have a chance.
Really for me, the acquisition of college talent is one of the most interesting parts of pro football period, and watching what they do in training camp is one of the more interesting times of the season. I love camp and the pre-season games and can hardly wait for it to start.