I've thrown some Hammer stuff, most recently the Brick. While it is a good ball, I decided to sell it since it really didn't get a ton of use. I also noticed that I didn't carry as well as my Storm/Roto Grip stuff. The other thing I noticed was that as I threw the Hammer stuff more, it was more sensitive to speed and/or conditions.
Same goes for all of my other EBI stuff except the Track 505T. Now that is a good ball and the only EBI product I have kept.
Just like any brand, people will match up really well with Hammer. Same goes for Track, Brunswick, Storm, Roto Grip, 900 Global, AMF, or anything else under the sun. I think Hammer fans are just that much more vocal about how their stuff matches up really well and they love to promote it. Nothing wrong with that at all.