I second many comments here, but to add something myself, I started out with leaps. In the very beginning all I had was a cardioid big-membrane ADK A51. Far from professional (the horror! THE HORROR!!!), but I had to start somewhere. Over the years I upgraded to mics like Röde NT-3, Line Audio CM-3 and Oktava MK-012 for example, but when I went pro I invested in a Sennheiser MKH 416.
Now I have a wide set with mics for different applications, but at the time I couldn't afford more microphones comparing in sound quality, so i went on and used it everywhere with good results.
Outdoors it's absolutely fantastic, most shotguns are really made for outdoor use, but indoors it still works pretty well as long as you adapt to it and don't expect it to behave as it does outside. All lobar mics (shotguns) I've worked with has lots of coloration on the sides which you have to take in account when aiming it, which also means positioning is more critical inside than outside, but, like many types of shortages of what was originally intended in equipment, it can be used as an artistic grip as long as you're very careful!
Frankly, had everything always been flawless we wouldn't have nice things like Rhodes-pianos, synthesizers, tube-distortion, anamorphic flares and Teflon to name but a few things ;-)