I have had some shitty luck with bots killing me at spawn as well, once objective is taken, they tend to flee, but not always, some stick around the secured objective, and then anyone in the spawn gets nailed, especially with that reload animation that leaves you somewhat unarmed. I think a decent fix for this would be to either override and force them to flee, even when fired upon, by disarming them similar to how we are disarmed when out of bounds, or improve the location of spawn. Maybe even a combination of the two.
One thing that does annoy the hell out of me about the bots is the amount of times I die by RPG lately... I can understand an rpg when we cluster up, but how do you win rpg on a 1v1 with a bot. I swear 80% of the times I die, it's an RPG, it's super annoying that.
As for the difficulty, as a newcomer to insurgency, i certainly like how tough and punishing it is, especially when you stray from team play, I like that you require the cooperation of your team to cover you when crossing the open or reloading etc, it really goes a long to way enforcing team play, and punishment is quite harsh in the sense that you end up being excluded in that particular round until the next objective becomes available. I like that the bots are punishingly difficult, however I can agree with some aspects that make them somewhat OP, like sniping with a pistol, and knowing your location and shooting through walls at mid to long range, however crouching and walking is a feature best applied for clearing rooms, and not giving away your location, I like that bots can take the initiative to shoot through doors and walls if they hear you on the other side.
That said, my main gripe is how fast paced the game is, which does take away from the more tactical and strategic aspects, and encourages rambo like run and gun game play as seen with battlefield and cod, it's rare to find a game with players trying to play properly, and then the short amount of time one has to take objectives does kill the need to take it slow and strategic, leapfrogging, checking corners and also clearing buildings methodically by crouching and walking. That is my experience in general.
I get that there are folks who like this, perhaps a solution to this might come in the form of casual and hardcore modes. who knows.