I don't have the inclination to add how much we've spent.
Forren/Mayuka - Pretty much disasters.
J-Rod - Like him and will be a good player IMO. Over priced, but we've had to pay the premium for young English talent.
Ramirez - It looked like a good signing on paper (I believe at the time most people were existed by the prospect and surprised we signed him), but it hasn't worked out (so far). A very frustrating player.
Yoshida - I like him too, nothing amazinf but a good solid centre half.
This window to sign 3 international players is excellent, but obviously the proof will be in the pudding.
So in conclusion, we've been a bit hit and miss, but you're talking like we're clueless. We're not perfect, but I don't think we're that different from a lot of clubs.