A have been feeling a bit meh about MW2. So recently I changed my killstreaks. Since my favorites have been maxed out on the challenges anyway.
I always thought sentry games for kills was cheesy. But I didn't realize that calling it in, getting the package, and setting it up and moving it is a pretty good challenge on it's own.
I also went to Precision Airstrikes. Funner than I thought. It's rewarding to get a bunch of kills by getting the right angle.
The sentry gun is a bit fun. I find it the same as a pavelow really. Either you set it up great and get plenty of kills. Or it gets killed after killing one person lol. Same as a pavelow either does well or gets shot down right away lol.