I'm probably a bit of an oddity being a straight man over 30 but I'm also a musical theatre performer so maybe that balances. I'm also a screen/stage writer, independent filmmaker, musician and sound engineer as well as an acting/voice/dance teacher. Additiojnally, I did some time as an IT professional (programming mostly) in the late 90's but that doesn't really apply here.
That being said, I like the show but I don't love it. There are a LOT of problems here.
The 'live' numbers are (very) obviously not. There's no attempt by the engineer to make it sound like the kids are performing in the spaces they're in. It's not that hard to do. I'm not the best audio guy I know but I know how to fix that.
Ok, soapbox time. AUTOTUNE IS THE DEVIL! I can hear it on almost everyone from time to time and I'll grudgingly accept that with television's tight production schedule that it might be occasionally necessary but I don't understand why you hire actors who can't sing to be in a show about kids who sing. Actually I do understand but if I went into it I'd be on a long rant about the industry and I'll spare you that.
Now Matthew Morrison (Schue) CAN sing. He's really, really good. No complaints. Jane Lynch - Ditto. Artie and Rachel are also both quite good. Stamos (when he shows up) is also excellent. Puck is O.K. but he doesn't have a lot of range. Finn has talent but he's extremely raw. I haven't heard enough of Blaine to make a decision but I have heard the dreaded AT on his voice more than once.
The others are mediocre to bad (Kurt is often shockingly bad) and studio magic cleans it up. Maybe the untrained ear can't hear it but I can and it annoys me to no end. Just so you know, the actor playing Kurt probably can't consistently produce those 'impressive' solos in a live setting.
I DO have a vocal processor in my studio. It's a fairly impressive-looking piece of gear. I never use it unless absolutely necessary on people I record and I NEVER use it on me.
By contrast the dancing is actually pretty good, what you see of it, but that's a combination of the director only showing you what's good (creative and/or strong technical camera work) and the fact that there's no way to electronically correct bad dancing.
The acting is usually good and it's getting better as the actor's settle into their characters a little more. If there is character inconsistency then it's most likely due to having multiple directors and multiple writers. Gwyneth Paltrow is terrible but then she usually is.
The writing is often sharp and snappy but it's a bit uneven (having multiple writers is partly to blame). Often I see characters saying and doing things that are not only inconsistent with the character as established but violate plot continuity (a consistent complaint of mine with television). Some of this can be chalked up to the 'character filter' but a lot of it is just flat-out bad writing.
I generally like the plot lines and their resolutions are usually satisfying although some of the more external plots (Stamos, Paltrow) often seem tacked on (I liked Idina Menzel, tho).
My main problem with the structure of the show is this: In a good musical (stage or film) the musical numbers flow organically from the story and the transitions from non-music to music are seamless with a natural flow. Often the show will shift back and forth within a song and if it's good it feels natural.
Now in GLEE, by contrast, the non-show musical numbers often have a stilted, contrived feel. So much so that if I don't like the song I'll fast forward through it since I know I won't get any useful plot information from it.
This isn't nit-picking. I could nit-pick for pages. The problem for me is I want to love this show and I only like it. And I only like it by doing my best to ignore it's obvious problems.
This isn't exactly a complaint but It's worth noting that these 'kids' are ALL old enough to be well out of high school (I believe Kurt is the youngest at 21) and in most cases out of college as well (Finn and Puck are nearly 30). This cast (if they could sing) would be more appropriate to RENT than GLEE. You can hide a lot with make-up and creative lighting but eventually it's going to show.
My 2 cents. Do with it what you like.
DeCarabas
maybe with a new bf 
he is such a great character too!