I have used the Mackie 8 buss boards more than I would like to admit. I understand that everyone has their own taste, but I found the EQ on the Mackie to be darned near useless. It seemed very slow. You make a change and slowly rotate the boost or cut knob and nothing happens till all of a sudden, there it is, but way too much of it. I also felt like it did not sound very "pretty" when using the EQ. It seems like for every change you make, it creates two new problems for you. For that reason I avoid the EQ section unless absolutely necessary.
As far as other issues with Mackie 8 buss boards go.... Talk to some techs that do repairs on Mackie's. They will all tell you that thaey get more Mackie mixers in for repairs than any other board, and often due to just standard regular use. The pots are horrible. They seem to be more succeptible to outside dust and such and gunk up much faster. I do not know why this is because they use the same pots as other Mackie mixers which do not seem to have this problem. It is pretty well known that the 8 buss series in specific has a lot of longecity and repair issues.
Some other Mackie issues... Channels in all of the pre Onyx series Mackie's seem to have real problems with crosstalk. Hit a channel hard sometime whil it is muted and then solo a channel on either side of it and see what you hear
Headroom.... The Mackie preamp has plenty of headroom on paper and is fairly quiet, until you hit about 30 db of noise at which point you start to really hear the effects of the Mackie circuit. Clipping.... Never hit the red light on a Mackie channel, it is displeasing and instantly obvious that something disastrous has happened. Many consoles out there really start to sound good as you enter this area. The Mackie reminds me of what happens when you hit a cheap converter with a signal 6db over 0.
Before any Mackie 8 buss owners chime in here wanting to defend the mackie name, keep in mind that just because your specific console may not have broke down (yet), this does not mean that these problems exist. The new Onyx series has addressed every one of the problems I have mentioned and is a whole different beast. Mackie 4 buss and lower models seems to not need nearly as many repairs. Lastly, I was a Mackie dealer for almost 7 years so my experience comes from dealing with LOTS of Mackie consoles, and not just one