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All Game Guide
The first licensed arcade game released for a console, Space Invaders was the first million-seller for the Atari VCS, firmly entrenching the system into mainstream America. The game is faithful in both spirit and play mechanics to its coin-op counterpart, but it does have a number of differences. Although there are only 36 invaders per wave (as opposed to 55), 112 game variations, including zigzagging laser bombs, two-player cooperative play, invisible invaders, and moving shields, more than make up for this deficiency. The home version doesn't look exactly like the original, but it does have appealing graphics, relatively faithful sound effects and excellent gameplay.
The Video Game Critic
It's a little slow, but Space Invaders is a legitimate classic that packs a good deal of shooting satisfaction. Tip: Enable the secret "double-shot" mode by holding down the reset button when you turn the game on.
The Atari Times
Supreme, supreme, simplistic classic. Nanu nanu, beedybeedybeedy (that's Twiki from the 1980s version of Buck Rogers, in case you don't get that reference), live long and prosper, "mostly harmless" (my foot!), and may the force be with you, and all that.
Game Freaks 365
In terms of replay value, it all comes down to how much you want to improve your high score. This game is fun enough that you very well might. But if you buy this game looking for an arcade-perfect port, you're doomed to be disappointed. If an arcade-perfect port is what you're looking for, go to atariage.com and buy the Space Instigators homebrew. If all you're looking for is a fun version of Space Invaders, you've got it right here a lot cheaper than that.