Well, for many, you hit the problem right on the head, the smell.  I vent with opened windows and a fan, but my family complains of the smell. So Acrylic with all their issues are worth it if it means more build time and peace in the house hold.

I also use MM, Tamiya, Vallejo, and Pollyscale.  All good stuff, just have to learn their own idiosyncracies.

Reasoned

Gee, what's the big deal about enamels, you get great paint with the added benefit of a high.  But seriously, I like the way MM enamels mix, spray and stay.

What he said!   Gee, in the small amounts of paint that we typically use, I can't imagine why enamels should be a big problem.  I use Model Master and Humbrol enamels almost exclusively and love the way they work.  They are easily and effectively thinned and clean up is easy too.   And yes, okay, I like the way they smell too!

Gee, what's the big deal about enamels, you get great paint with the added benefit of a high.  But seriously, I like the way MM enamels mix, spray and stay.

I try to use acrylics whenever possible.  I love Vallejo Model Air paints because they give such a smooth and even finish.  Tamiya paints are nice b/c they give a good finish and are very cost efficient.  MM Acryl paints do have durability issues but I add a couple drops of future in the mix and that seems to help just as long as you don't yank the masking tape off and lay down a primer, it should hold up no problem.

I use both mm enamels and tamiya acrylics.  i never had a problem with mm enamels and they always give me a good finish. rock solid when the fully cure also. mm acrylics are total trash. they have no bite what soever. they need a good prime to set correctly. wish tamiya would add FS codes to their paint line. only thing they really lack.

Throwing my hat in the ring.....

When I painted Games Workshops figures, I used Citadel and Vallejo paints.  When I came back to modeling, I went with Vallejo Model line.  I exclusively hand brush (don't have an air brush) and so far, so good.  

After hurricane Sandy, I was toying with switching paints, but for the moment, I'm sticking with Vallejo.

(Full disclosure:  I do have some paints from MM, and I'm looking to experiment with some Tamiya.)

Nice work there CNicoll!

I hate enamel paint, poisonous and last time I used it took  forever to dry. I rarely use anything other than MM acrylic and Tamiya paint. I've never had any real problems with either. Easy clean-up, less toxic, they dry faster, and you get a more consistent better quality finish than enamels.  

Both MM and Tamiya are good paint, only downside is you can't mix them with good results. Pollyscale is good too but I believe out of production. Gunze Sangyo is great stuff but I've had limited experience with it.  

Agree with Bearcat and I've never really had much of a problem with MM, Tamiya or the PollyScale acrylics.  The key is definitely proper prep - clean surfaces, etc.  Yes, the acrylics can be a bit delicate in my experience so if I'm planning on doing a lot of masking, I prefer enamels, or if I will shoot a coat of Future and let it harden then do my masking (or whatever).

When I brush the acrylics I do tend to thin them as well and I find no problems with brush strokes.  I paint indoors with somewhat limited ventilation so I like the lower fumes of the acrylic paints (note, 'lower' not 'none').

These were both done with acrylics:

To me, the advantages of enamel outweigh the need for a solvent.  Enamels can be both brushed and sprayed, while some acrylics do not brush well.  I find far less compatibility problems with enamels. If you do a subject that needs a glossy finish, I find glossy finish to be much easier with enamels. Some folks have adhesion problems with some of the acrylics.  Also, while you can thin acrylics with water, most modelers I know use a water/alcohol mix, and alcohol is a solvent.

I use a spray booth with a good filter for rattle cans, which eliminates much of the odor.  In airbrushing I use so little paint that odor is not a big problem.