DL650 does remarkably well two-up. Can only be disappointed if you expected it to match a 1000, which it does not. Try one with the pillion.
By no means an off-road bike, just too heavy, but so are almost all bikes that are suited for 2-up IMO, or at least they go way over budget. And a good rider can take even a DL650 surprisingly far... bad rider will soon end up on his/her ear, and blame the bike