Re: your negatives.
1. Agree, synths aren't great. I find the pitch shifters OK.
2. True, there's no XLR but as the output is balanced a short TRS to XLR is all that's needed, and your sound guy won't care.
3. Yes 3 switches is limiting depending on your use case. Not for me. I'll go into detail below, but as mentioned you can add two more switches or a midi controller, or falling that get the Stomp XL if you really need the switches.
4. Agree, decent metering would be nice.
5. There are ways to power the Stomp from the likes of a One spot.
6. I think the unit feels sturdy.
To the OP:
In my opinion, it depends on the type of gig you have if the stomp works for you. So I'll give you a run down.
Do you use multiple tones per song, or are you engaging multiple effects per song? Stomp MAYBE good. (some thought and good programming will be required)
Do you plan to go ampless, direct to PA and monitor through a wedge/FRFR or IEM? Stomp is PERFECT.
Do you plan to control the stomp via MIDI? Stomp is GREAT.
Do you want to integrate the Stomp into a pedalboard? Stomp is GREAT.
I'll admit for my gig I barely scratch the surface of the Stomp. I go ampless direct to FOH/IEM. I use three tones per gig, and never engage any other effects during a song. We play to tracks, so my Stomp is controlled via midi from our BT player. Song starts, my patch is called up and off I go. I only touch the Stomp to tune. I did buy a cheap dual footswitch for mode/tuner control if I ever feel the need to take up the 3 onboard switches with anything. But right now I don't. For my gig the Stomp is perfect. YMMV
Bottom line if the amount of switches are a dealbreaker, look at the Stomp XL or Helix LT.
If the DSP restrictions (only 8 blocks per patch) are a dealbreaker then look at the LT.