I think they knew there was going to be camping, but I wonder if they knew how much camping there was going to be.
The biggest problem with internal playtesting is that you're biased to a small sample size. I don't know what IW's testing procedures are like, so I'm spitballing here, but if they had playtesters who don't camp, or their best players were very aggressive, it skews their results dramatically. For modes like Ground War, it gets even harder to test because there's no way they're scraping 64 players together on the regular... much less 20 on a daily basis for 10v10. A lot of companies also tend to be biased when it comes to playtesting etiquette--because you're playing against coworkers, "cheesy" strats can often be informally banned, which leads to a different meta than what you'd find on live where it's no holds barred. They're also likely not testing under "new player" conditions--so they probably have everything unlocked. All-in-all it's a very different environment from live and there's good reason why they wouldn't have exposed what 1 day of live feedback has uncovered.
That makes sense what you wrote but when but when you're dealing with the online population they should have known what the outcome was going to be, at least that is what I think.
People want to show off their kills or get that 11 killstreak. IW created maps with corners, higher altitude, doors, windows etc.
What did IW think would happen? The rule of thumb for call of duty games is if there is a map people can camp in they will.
The example I gave earlier was that construction site map. I started in the back where the construction site would be on my right. Now let me preface that I am not great COD player. I have. 1.17 KDR.
I started off 0-10 and 8 or 9 of those deaths were because of the other team simply camping a little past the spawn and killing me when I walked out. No matter which way I went there would be someone there with a mounted gun or a sniper rifle killing me. It was completely absurd and after the 10 death I finally left.
I guess I just have a difficult time believing IW didn't see this coming. Few people run around and the game has turned into find a spot to camp and wait there for some sucker to walk in front of you or peek their head out.
Edit:I just want to say I'm not opposed to maps were you can camo either. I like those once in a while to try to get longshots etc. But when every map is a campers map it's a major problem.
I'd like to say I'm hopeful IW can fix this with some new maps but that's asking a lot considering how was lousy their track record has been.