Yes, it is a pity that the several reverbs do not come with "good" presets. There are some options within some of the reverbs, but there is nothing that could compete with user friendly presets of other manufacturers. But the effects do have potential and you can create your own presets. Here is one which is creating a "mighty" reverb.
"335 Digital Reverb" (based on Set 1, Concert Hall), modified
Predelay 10.0 ms
Low Pass 15.00kHz
LP Damp Freq. 250.0 Hz
LF Damp Gain -5.00 dB
One more thing: You need to use the equalizer on FX send and FX return. +2 dB @ 5 kHz is a good setting, but also check more gain like + 4 dB. Not to forget compression. Reverbs do sound very different when the FX send is compressed. If you want a more "stable" reverb, use compression on the send.