I love my Dual Rec. With the right pedal to shape the EQ at the input, it can absolutely get as tight as a Mark series amp or whatever else. That's the secret/beauty of the Dual Rectifier. It basically doesn't filter away any bass at the input of the amp. The negative of this design is of course that by default the sound can be flubby and undefined, but the benefit is that Rectos allows the player to shape the preamp in virtually any way they want. Basically, with a lot of high gain amps, a lot of filtering is done at the input internally so there's only so much you can do to shape their sound because you can't add back what isn't there. With Rectos, everything you give them is sent right on through so you're free to sculpt away whatever frequencies you want to suit your playing.
Here's my Dual Recto on the Orange Modern channel, stock:
Here's the exact same guitar line reamped through the exact same amp with the exact same settings, but with just a Boss GE-7 cutting a ton of bass and boosting a ton of treble. The pedal's level overall is on 0 db so it's only cutting and boosting exactly how the sliders are set.
And just for fun, here's the same setup but with the GE-7's output level boosted, hitting the Recto's input with around +12 db.
I used pretty extreme settings on the Graphic EQ here to exaggerate the effect but I cannot stress enough how much a simple bass cut / treble boost at the input can make a Recto as tight as you want.