considering all the avatar sounds are pretty processed, and the snare and toms take practically no work to get to sit in a mix, it does make the kicks seem a bit off. granted with processing you can improve them, but in most cases of me using them they are tuned too high and to get them usable you have to pitch shift them down and eq. id rather just replace with a lower sample than be messing with that tbh as they already sound pretty damn eq'd to me.
and yes, to a certain extent it is about the processing, but its not JUST about that. it would be nice to have a kick in there thats 95% ready for me to use like the rest of the drums in that pack. you shouldnt have to bend over backwards to get something to work - in my experience its just an uphill battle. im happier with starting with something good and using minimal processing to fix it.
that said its all preference so im sure there are a lot of cases where they'll do fine.