never had any issues with blobs. neither usf nor okw. the ppl i see blobbing are always rank 1000+ish and its a really bad start map control wise
and theres plenty of things to do. out cap him as i mentioned, because youll basically always can tell where his whole army is. use mgs BEHIND mainline inf (ofc a blob will take out a mg thats on the frontline, derp). bomb the shit out of him... you cant miss when firing explosive stuff at the blob (demos are especially useful)... and if all fails: counterblob
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in my humble opinion its a learn to play issue (not like in "you suck if you cant handle blobs", nono. more like you need to play totally different when fighting blobs which might take some practice)