Meterpreter
The discovery scan completed by Metasploitable is not nearly as robust as the scan you will get from your vulnerability management program. If you still have Nexpose Community installed, launch a vulnerability scan using the full audit template against the Metasploitable2 machine. The list of possible exploits you can use may include exploits that can give you a shell on a system.
A successful exploit can give you access to a target system in a multitude of ways. The premier access of choice is a meterpreter shell. A command shell is nice, and PowerShell is even nicer, but until you have a meterpreter shell on a Windows system, you've not experienced perfect red team bliss. No one forgets his or her first meterpreter shell. Teaching Metasploit for the past couple of years, I've had students astounded when they see the power embedded in a meterpreter shell on a compromised system. You can steal hashes of passwords, take screenshots, explore hard drives, escalate privileges...
