They are a great mask..., those who 'have problems' with them just are not using them properly. To respond to a few of your comments...,
The screws in the nose block are a sometime aftermarket add-on by users to prevent the nose block from falling out. You can back them off to move the block higher then put them back in. (a small zap strap will do the same thing) I prefer to have the block below my nose so I can nose breathe while diving. If I need the block to equalize I hold the reg portion and slightly push it in and up to contact my nose.
They are crazy easy to clear, and very difficult to flood. When not diving helmets, AGA's are the only other mask we use. Each of our divers has to practice full remove and replace with an instructor at least once a year. We've even played in a pool buddy breathing with four guys on one AGA. If it is fully removed, you grab the bottom straps and pull it down over your head, then like clearing a mask you hold the top and faceplate, then push the purge and it'll clear no problem. Just do not practice this without a buddy and preferably a trained FFM instructor to provide instruction and guidance.
The biggest issue I have seen with people complaining about the mask is improper donning. You need it to be put on right. First loosen all five of the spider straps out as far as they will go. Pull the mask down over your head ensuring the the strap is down the back of your head as far as it'll go. Tighten up the bottom two straps nice and snug, equal on each side but not too tight to hurt your jaw. Then tighten the temple straps. Now the top strap, but it should only be a very small amount. If you have more than an inch of strap up top then it is too much. Most full grown men I see using the mask never tough it at all. If you are getting bubbling at the top you need to snug up the bottom again then the temples in that order. Pulling on the top one too much will cause the mask to want to pull up over your chin, which pulls the mask away from your face and the bubbling will get worse.
Make sure that when you tighten the mask you pull the straps back along your head, and not out at a right angle from your head. That will cause tearing of the skirt where the strap buckles are attached and ruin your skirt.
It may take a dozen dives or so to get use to it and how tight you want to tighten it. It'll seal, trust me. I've even had my kids when they were 8 and 9 years old wearing one in the shallow end of our pool and they could get a good seal. You will just have to play with it. Once you get use to it you'll never want to put another reg in your mouth!!