While I agree with the majority of your post, there are some things that could be patched/tuned for special teams:
1. Stop the receiving team blockers from jumping up at the line to try to block punts. It's ridiculous and the only thing it serves to do, other than just look flat-out stupid, is make sure that any returner reaching the second level will be destroyed.
2. For the CPU, and coach mode players, tune the returners to try to take the ball outside. Right now AI-controlled returners will only make slight adjustments to their path. They never try a full cut to the outside, instead going right into the teeth of the kicking team's pursuit. To test out what I mean, call a punt block when the opposing team has the ball on the hash, then let the AI control the returner for you. Assuming the CPU didn't leave their gunners out instead of bringing them in to help block (I've only seen this happen once) your returner will have an entire side of the field open to them. I guarantee, though, that he'll go straight into the tacklers instead of going to the open sideline.
Obviously this isn't a problem for online players, but it is a problem for any offline player since the CPU will never have any decent returns, and doubly so for any coach mode players.
I really believe those two things could be adjusted in a tuner or a patch.
My other pet peeve with special teams is how the AI can never, ever come close to blocking a kick. I have no idea why, and even less idea of how they can fix it since I can't even figure out why the AI sucks so bad at getting any sort of pressure on the kicker. Maybe it's something that could be tuned, maybe it isn't. But something isn't right.

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