...If by stating "pile of crap" you mean "a great emulator" for the Atari 7800, ColecoVision and Vectrex. It is my preferred and nearly exclusively used emulator for those three systems.
Especially regarding the Atari 7800 and ColecoVision, factor in HLSL with YUV enabled and in many cases it is indistinguishable from the actual console running a game on a traditional CRT.
In fact, it is the only Atari 7800 emulator that does this properly:
Obtain a HQ artwork pack for the Vectrex games' overlays and it is the best you can do for playing that system on any recent Windows OS.
Now if you have a specific system or list of systems it does not emulate well, you are probably a tad frustrated by it.
Regardless, if you mean 'pile of crap' as in literal, you are wrong. If you mean it figuratively, you need a better case or justification.
The multiple base system input mappings, controller mapping and tweaking of system video and audio options are enormous. Though may not have everything you desire it to contain.
Please elaborate on the "pile of crap" statement...I'm genuinely curious why you define it that way. Besides perhaps being unable to configure and get it running or/and looking 'properly' for you.