The fact is that you cannot do everything with convolution. If a reverb uses complex modulation, you cannot copy that 100% accurately with convolution. When you take the impulse response, the modulations may change the sound differently every time you take a new impulse response. Also you cannot tweak the reverb parameters with convolution reverb. You cannot build a new reverb using a convolution reverb plugin. You have to use an artificial reverb plugin to do that.
A convolution reverb plugins is a very static plugin. You can't change many parameters and usually if you change the reverb decay the reverb won't sound as good anymore. It's almost the same as if you play a JP8000 it sounds like a JP8000 but if you sample the JP8000 and play it with a sampler, it won't sound the same. If you tweak the filters of the sampler the sound gets worse because it's not the original machine's filter you're tweaking.
I don't like convolution reverbs as much as artificial reverbs because convolution reverbs need more cpu to run and the parameters are not as tweakable. I have a space designer in logic, but I always use the powercore reverbs. Only in very rare situations I use the space designer. But if you find or record good impulse responses which work in your project, use them.
And of course, if you don't have a powercore, convolution is the only way to get as good results, if you find as good impulse responses.
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