--FX are surprisingly well done. I will be shocked if they keep that level of quality.
--Nice brisk origin story. I did not want to wait several episodes for Flash to emerge.
--The lead is a likeable peter parker clone.
--Real stakes: people died.
--Metahuman premise is a cool one. Though it messes with Arrow in a big way.
--Nice cross-over from The Arrow.
--Really enjoyed the realistic portrayal of what happens to Beta orbiters when an Alpha shows up, and why it's fucking stupid to allow yourself to be friendzoned for year after year.
--John Wesley Shipp! Hope I age as well as him.
--The casting of the love interest. Zero chemistry. With anyone. The sidekick with the murdered fiance despite being depressed had more spark.
--Any type of time/travel or future-seeing powers. Has this not been demonstrated enough already? That. shit. never. works. NEVER. NEVER NEVER NEVER. It's either an annoying vague seance type nonsense, or it's too powerful. Either way, it's not an interesting counter-point to the Flash's also insanely powerful abilities.
--Killing off tornado dude. Why? Also, not sure why they made him a run of the mill moron criminal.
--Unrealistic use of speed. You can't have him running into things and not get seriously hurt.
--This is going to make the entire non-meta-human canon of Arrow completely pointless. The Flash is so overpowered it's crazy. They need to put some limits on him. Maybe after a few minutes he needs candy, or some shit.
--So ... your dad is wrongfully imprisoned. You become a near-god. There better be some explanation/discussion/storylines in which the Flash contemplates just breaking him out.
--That suit. Ditch it/revamp it immediately.