I have had only one bad "personal" experience with them myself. One and done for me. Along with that, I know over 200 people "personally" who have also had bad experiences with them. 1and1 is famous only because of their bad rep. If your happy with them then by all means continue to use them. I only chimed in to share what I've learned and know about their services.
You seem to have taken this a little personally, maybe you work for them?
No, I do not work for them but I've used several different hosts over the 10+ years I've had web sites and have an understanding that not every company can be perfect. They will all have critics as well as those who praise them. As I stated above, you can find critics for just about any company out there by performing a Google search with the company name + the word "sucks". It's not unique to 1and1!
As for you knowing 200 people "personally" who have had bad experiences with them... how did you come to know over 200 people "personally" that all share this one company in common? In addition they ALL had bad experiences with them?

I would consider knowing 200+ people "personally" as a large SOI. If it is based on people who focus on negative experiences with web hosting companies, how's the real estate business?

I'm not taking any of this too seriously, let alone personally. I just don't feel like blanket statements and posible embelishments are vaild in providing a true picture of a company and the service that they provide.
Bottom line.. every company has good & bad reviews.
You've stated your opinion as have I. Let's allow others to decide.
Best of luck to you...