That's strange. A guy on another forum weighed a 66MHF Avid and a 66MHF Mojo and the Mojo was lighter. To confirm this finding, I went to the St Croix website and did a comparison of the listed rod weights. For the 6 casting rods with identical ratings, the Mojo had the lower listed weight 4 times. the two exceptions were 70MF 4.2 oz. Mojo vs. 4.1 oz. Avid, and 70HF 5.3 Mojo vs. 5.0 Avid. The most any of them differed by was .3 oz, which is hardly a huge difference and probably not enough to reliably tell a difference by holding them.
edit: Looks like hawgchaser beat me to it.
The numbers on paper might be correct, but they DO NOT correlate to my impressions in the store. .3 oz is IMPERCEPTIBLE to most mortals. You guys need to stop looking at spec sheets, and actually use the product. Overall, the Mojos left me unimpressed, and I was really looking forward to getting several. I'll be buying none.
I have not used any Avids, and won't be getting any any time soon because they are out of my price range. I have handled them in stores, and they are nice rods. Maybe when I am out of college and have a real full time job I will be able to get some. On the other hand, I do have a Mojo that I am very impressed with so far, although my use of it has been limited to backyard practice. It is also the first rod over $50 I have had, so to me it feels like the best rod in the world. I brought up the actual weights just to show that our perceptions can sometimes be deceiving, I probably should have made that more clear. Ultimately how it feels to you is more important than the specs, you're absolutely right. If you feel like the Mojos are significantly worse than your Avids, fish your Avids and be happy. I will continue enjoying my Mojo.